Leases (Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Leases [Abstract]
ROU assets, net of amortization	$ 183	$ 195
Lease liabilities	209	222
ROU assets, net of amortization	4	4
Finance lease obligations	$ 4	$ 4
Weighted average remaining lease term, operating leases	8 years 6 months	8 years 6 months
Weighted average remaining lease term, finance leases	17 years 9 months 18 days	18 years 3 months 18 days
Weighted average discount rate, operating leases	2.80%	2.80%
Weighted average discount rate, finance leases	3.10%	3.10%