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Supplemental Cash Flow Information - Cash Flows Related to Taxes, Interest, Leases, and Capital Expenditures Included in Accounts Payable (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplemental disclosures:      
Cash (received for income taxes, net of payments) paid for income taxes, net of refunds $ (2) $ 69 $ 31
Cash paid for interest 113 104 103
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases 17 16  
Operating cash flows from finance leases 6 6  
Financing cash flows from finance leases 5 5  
Non-cash investing and financing activities:      
Change in construction in progress included in accounts payable $ (3) $ (7) $ 9