Annual report pursuant to Section 13 and 15(d)

Supplemental Disclosures to Consolidated Statement of Cash Flows - Cash, Cash Equivalents and Restricted Cash (Details)

v3.10.0.1
Supplemental Disclosures to Consolidated Statement of Cash Flows - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of Significant Accounting Policies        
Cash and cash equivalents $ 653 $ 903    
Restricted cash included in other current assets $ 7 $ 9    
Restricted Cash and Cash Equivalents, Asset, Statement of Financial Position [Extensible List] Other Current Assets [Member] Other Current Assets [Member]    
Total cash, cash equivalents and restricted cash in the condensed consolidated statement of cash flows $ 660 $ 912 $ 836 $ 2,460