Leases Supplemental Operating Lease Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash flows for operating leases (for the nine months ended)	$ 46	$ 54	$ 50
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 3	$ 49	$ 42
Weighted-average remaining lease term in years for operating leases	6 years	7 years	6 years
Weighted-average discount rate for operating leases	3.00%	3.10%	3.50%