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Leases Supplemental Operating Lease Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating cash flows for operating leases (for the nine months ended) $ 54 $ 50
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 49 $ 42
Weighted-average remaining lease term in years for operating leases 7 years 6 years
Weighted-average discount rate for operating leases 3.10% 3.50%