Long-term and Short-term Debt (Short-term with Maturities of Year or Less) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Commercial paper	$ 0	$ 99
Other Short-term Borrowings	119	76
Short-term Debt	119	175
Average daily balance	$ 142	$ 237
Average days outstanding	65 days	157 days