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Leases - Schedule of Cash Flows Related to Company's Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases $ 101    
Operating cash flows from finance leases 2    
Financing cash flows from finance leases 3 $ 0 $ 0
Non-cash lease liabilities activity:      
Leased assets obtained in exchange for new operating lease liabilities 48    
Leased assets obtained in exchange for new finance lease liabilities $ 62