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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Supplemental Cash Flow Information [Abstract]    
Cash payments for interest, net of amounts capitalized $ 238 $ 242
Net cash payments (receipts) for income taxes, net of refunds 32 (5)
Accrued dividends and distributions to non-controlling interests in subsidiaries $ 0 $ 12