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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Supplemental disclosures:    
Cash paid for income taxes, net of refunds $ 57 $ 13
Cash paid for interest 55 55
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 12  
Operating cash flows from finance leases 5  
Financing cash flows from finance leases 4  
Non-cash investing activities:    
Change in capital expenditures included in accounts payable $ (4) $ 2