Please answer the given financial question based on the context.
Context: |||Fiscal Year End|
||2019|2018|
|||(in millions)|
|Deferred tax assets:|||
|Accrued liabilities and reserves|$  245|$  255|
|Tax loss and credit carryforwards|6,041|3,237|
|Inventories|43|58|
|Intangible assets|964|—|
|Pension and postretirement benefits|248|179|
|Deferred revenue|4|5|
|Interest|134|30|
|Unrecognized income tax benefits|7|8|
|Basis difference in subsidiaries|—|946|
|Other|8|13|
|Gross deferred tax assets|7,694|4,731|
|Valuation allowance|(4,970)|(2,191)|
|Deferred tax assets, net of valuation allowance|2,724|2,540|
||||
|Deferred tax liabilities:|||
|Intangible assets|—|(552)|
|Property, plant, and equipment|(57)|(13)|
|Other|(47)|(38)|
|Total deferred tax liabilities|(104)|(603)|
|Net deferred tax assets|$ 2,620|$  1,937|
Deferred Tax Assets and Liabilities
Deferred income taxes result from temporary differences between the amount of assets and liabilities recognized for financial reporting and tax purposes. The components of the net deferred income tax asset were as follows:
Question: What was the change in deferred revenue in 2019 from 2018?
Answer:
-1