Leases (Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
ROU assets, net of amortization	$ 172	$ 173
Lease liabilities	198	198
ROU assets, net of amortization	3	4
Finance lease obligations	$ 4	$ 4
Weighted average remaining lease term, operating leases (in years)	8 years 8 months 12 days	8 years 4 months 24 days
Weighted average remaining lease term, finance leases (in years)	16 years 6 months	17 years 4 months 24 days
Weighted average discount rate, operating leases	3.40%	2.90%
Weighted average discount rate, finance leases	3.10%	3.10%