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Leases (Supplemental Cash Flow Information Related to 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 $ 58 $ 51  
Financing cash flows from finance leases 3 15 $ 0
Right-of-use assets obtained in exchange for lease obligations:      
Operating leases $ 53 $ 33