Quarterly report pursuant to Section 13 or 15(d)

Recent Accounting Pronouncements (Cash and Restricted Cash) (Details)

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Recent Accounting Pronouncements (Cash and Restricted Cash) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Cash and cash equivalents $ 657 $ 903    
Total cash, cash equivalents and restricted cash in the condensed consolidated statement of cash flows 665 912 $ 916 $ 836
Other Current Assets        
Restricted cash included in other current assets $ 8 $ 9