code: public void setAccountIds(java.util.Collection<String> accountIds) {
          if (accountIds == null) {
              this.accountIds = null;
              return;
          }
  
          this.accountIds = new com.amazonaws.internal.SdkInternalList<String>(accountIds);
      }
docs: <p>
  The 12-digit account ID of the account being aggregated.
  </p>
  
  @param accountIds
  The 12-digit account ID of the account being aggregated.