Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Beginning balance	$ 151	$ 157
Additions related to current years' tax positions	2	6
Additions related to prior years' tax positions	28	26
Unrecognized Tax Benefits, Increase Resulting from Acquisition	0	11
Reductions due to lapse of statue of limitations	(6)	(6)
Settlements with tax authorities	(7)	(43)
Ending balance	$ 168	$ 151