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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Supplemental Cash Flow Information [Abstract]    
Cash payments for interest, net of amounts capitalized $ 416 $ 444
Net cash (receipts) payments for income taxes, net of refunds (4) 39
Acquisition of subsidiary common stock included in accrued expenses and other liabilities 0 51
Seller financing secured mortgages resulting from disposition of assets 0 375
Capital expenditures included in accounts payable, accrued expenses and other liabilities $ 11 $ 8