Leases (Supplemental Cash Flow Information Related to Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating cash flows related to operating leases	$ 180	$ 160	$ 166
Finance Lease, Interest Payment on Liability	3	3	4
Financing cash flows related to finance leases	13	10	14
Right of use asset obtained in exchange for operating lease liability	216	221	156
Right of use asset obtained in exchange for finance lease liability	$ 12	$ 6	$ 9