Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.

Text: credit commitments and lines of credit the table below summarizes citigroup 2019s credit commitments : in millions of dollars u.s . outside of u.s . december 31 , december 31 . <table class='wikitable'><tr><td>1</td><td>in millions of dollars</td><td>u.s .</td><td>outside ofu.s .</td><td>december 312018</td><td>december 31 2017</td></tr><tr><td>2</td><td>commercial and similar letters of credit</td><td>$ 823</td><td>$ 4638</td><td>$ 5461</td><td>$ 5000</td></tr><tr><td>3</td><td>one- to four-family residential mortgages</td><td>1056</td><td>1615</td><td>2671</td><td>2674</td></tr><tr><td>4</td><td>revolving open-end loans secured by one- to four-family residential properties</td><td>10019</td><td>1355</td><td>11374</td><td>12323</td></tr><tr><td>5</td><td>commercial real estate construction and land development</td><td>9565</td><td>1728</td><td>11293</td><td>11151</td></tr><tr><td>6</td><td>credit card lines</td><td>605857</td><td>90150</td><td>696007</td><td>678300</td></tr><tr><td>7</td><td>commercial and other consumer loan commitments</td><td>185849</td><td>102918</td><td>288767</td><td>272655</td></tr><tr><td>8</td><td>other commitments and contingencies</td><td>2560</td><td>761</td><td>3321</td><td>3071</td></tr><tr><td>9</td><td>total</td><td>$ 815729</td><td>$ 203165</td><td>$ 1018894</td><td>$ 985174</td></tr></table> the majority of unused commitments are contingent upon customers maintaining specific credit standards . commercial commitments generally have floating interest rates and fixed expiration dates and may require payment of fees . such fees ( net of certain direct costs ) are deferred and , upon exercise of the commitment , amortized over the life of the loan or , if exercise is deemed remote , amortized over the commitment period . commercial and similar letters of credit a commercial letter of credit is an instrument by which citigroup substitutes its credit for that of a customer to enable the customer to finance the purchase of goods or to incur other commitments . citigroup issues a letter on behalf of its client to a supplier and agrees to pay the supplier upon presentation of documentary evidence that the supplier has performed in accordance with the terms of the letter of credit . when a letter of credit is drawn , the customer is then required to reimburse citigroup . one- to four-family residential mortgages a one- to four-family residential mortgage commitment is a written confirmation from citigroup to a seller of a property that the bank will advance the specified sums enabling the buyer to complete the purchase . revolving open-end loans secured by one- to four-family residential properties revolving open-end loans secured by one- to four-family residential properties are essentially home equity lines of credit . a home equity line of credit is a loan secured by a primary residence or second home to the extent of the excess of fair market value over the debt outstanding for the first mortgage . commercial real estate , construction and land development commercial real estate , construction and land development include unused portions of commitments to extend credit for the purpose of financing commercial and multifamily residential properties as well as land development projects . both secured-by-real-estate and unsecured commitments are included in this line , as well as undistributed loan proceeds , where there is an obligation to advance for construction progress payments . however , this line only includes those extensions of credit that , once funded , will be classified as total loans , net on the consolidated balance sheet . credit card lines citigroup provides credit to customers by issuing credit cards . the credit card lines are cancelable by providing notice to the cardholder or without such notice as permitted by local law . commercial and other consumer loan commitments commercial and other consumer loan commitments include overdraft and liquidity facilities as well as commercial commitments to make or purchase loans , purchase third-party receivables , provide note issuance or revolving underwriting facilities and invest in the form of equity . other commitments and contingencies other commitments and contingencies include committed or unsettled regular-way reverse repurchase agreements and all other transactions related to commitments and contingencies not reported on the lines above . unsettled reverse repurchase and securities lending agreements and unsettled repurchase and securities borrowing agreements in addition , in the normal course of business , citigroup enters into reverse repurchase and securities borrowing agreements , as well as repurchase and securities lending agreements , which settle at a future date . at december 31 , 2018 , and 2017 , citigroup had $ 36.1 billion and $ 35.0 billion unsettled reverse repurchase and securities borrowing agreements , respectively , and $ 30.7 billion and $ 19.1 billion unsettled repurchase and securities lending agreements , respectively . for a further discussion of securities purchased under agreements to resell and securities borrowed , and securities sold under agreements to repurchase and securities loaned , including the company 2019s policy for offsetting repurchase and reverse repurchase agreements , see note 11 to the consolidated financial statements. .
Question: what is the total credit commitments and lines of credit in 2018?

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