Leases (Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Leases [Abstract]
ROU assets, net of amortization	$ 174	$ 173
Lease liabilities	199	198
ROU assets, net of amortization	3	4
Finance lease obligations	$ 4	$ 4
Weighted average remaining lease term, operating leases	8 years 7 months 6 days	8 years 4 months 24 days
Weighted average remaining lease term, finance leases	17 years 1 month 6 days	17 years 4 months 24 days
Weighted average discount rate, operating leases	3.00%	2.90%
Weighted average discount rate, finance leases	3.10%	3.10%