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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]      
Cash payments for interest, net of amounts capitalized $ 658 $ 662 $ 602
Net cash payments (refunds) for income taxes 150 87 (1)
Acquisition of subsidiary common stock included in accrued expenses and other liabilities 51 0 0
Seller financing secured mortgages resulting from disposition of assets 375 0 0
Investment in subsidiaries prior to acquiring a controlling interest 0 286 36
LP unit issuance for remaining 25% interest in ARL 0 35 0
Fair value of subsidiary common units issued in an acquisition of business 0 336 0
Fair value of debt assumed in an acquisition of business 0 368 0
Capital expenditures included in accounts payable, accrued expenses and other liabilities $ 80 $ 89 $ 88