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Short-Term Debt - Summary (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Short term borrowings
Commercial paper	$ 5,612	$ 4,654
Notes payable to banks and others with originating terms of one year or less	15	228
Current maturities of long-term debt	2,600	5,054
Current maturities of long-term finance leases	186	18
Redeemable long term obligations - Long-term debt	2,960	3,078
Subtotal	11,373	13,032
Reclassified to long-term debt	(9,825)	(9,750)
Total short-term debt	$ 1,548	$ 3,282
Weighted-average interest rate	0.15%	1.69%

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