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Leases (Supplemental Lease Information) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating cash flows from operating leases $ 75 $ 73
Operating leases $ 64 $ 33
Operating leases 7 years 6 years
Operating leases 2.50% 2.70%