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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Supplemental Cash Flow Information [Abstract]    
Cash payments for interest, net of amounts capitalized $ 252 $ 255
Net cash payments for income taxes, net of refunds 12 16
Acquisition of subsidiary common stock included in accrued expenses and other liabilities 0 51
Capital expenditures included in accounts payable, accrued expenses and other liabilities 11 10
Accrued dividends and distributions to non-controlling interests in subsidiaries $ 12 $ 0