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Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]      
Interest paid, net of amount capitalized $ 372 $ 436 $ 543
Income taxes paid, net of refunds 8 9 9
Additions to fixed assets for accrued capital expenditures $ 1 $ 20 $ 19