Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Outstanding Balance	$ 6,442	$ 3,100
Short-term Debt [Member]
Short-term Debt [Line Items]
Year-End Stated Rate on Debt	1.59%	2.13%
Commercial Paper [Member]
Short-term Debt [Line Items]
Outstanding Balance	$ 3,001	$ 752
Commercial Paper [Member] | Short-term Debt [Member]
Short-term Debt [Line Items]
Year-End Stated Rate on Debt	1.94%	2.71%
Other Short Term Borrowings [Member]
Short-term Debt [Line Items]
Outstanding Balance	$ 3,441	$ 2,348
Other Short Term Borrowings [Member] | Short-term Debt [Member]
Short-term Debt [Line Items]
Year-End Stated Rate on Debt	1.28%	1.94%