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Leases - Schedule of Cash Flows Related to Company's Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases $ 91 $ 101  
Operating cash flows from finance leases 4 2  
Financing cash flows from finance leases 6 3 $ 0
Non-cash lease liabilities activity:      
Leased assets obtained in exchange for new operating lease liabilities 23 48  
Leased assets obtained in exchange for new finance lease liabilities $ 19 $ 62