Debt (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Outstanding Balance	$ 2,243	$ 1,878
Average commercial paper outstanding	$ 0	$ 628
Short-term Debt
Short-term Debt [Line Items]
Year-End Stated Rate on Debt (as a percent)	0.58%	0.61%
Commercial Paper
Short-term Debt [Line Items]
Outstanding Balance	$ 0	$ 0
Commercial Paper | Short-term Debt
Short-term Debt [Line Items]
Year-End Stated Rate on Debt (as a percent)	0.00%	0.00%
Other Short Term Borrowings
Short-term Debt [Line Items]
Outstanding Balance	$ 2,243	$ 1,878
Other Short Term Borrowings | Short-term Debt
Short-term Debt [Line Items]
Year-End Stated Rate on Debt (as a percent)	0.58%	0.61%