Long-term and Short-term Debt (Short-term with Maturities of Year or Less) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Commercial paper	$ 100	$ 100
Other Short-term Borrowings	241	293
Short-term Debt	341	393
Average daily balance	$ 300	$ 326
Average days outstanding	155 days	69 days