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Short-Term Debt - Summary (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Short term borrowings    
Commercial paper $ 0 $ 5,612
Notes payable to banks and others with originating terms of one year or less 62 15
Current maturities of long-term debt 4,946 2,600
Current maturities of long-term finance leases 48 186
Redeemable long term obligations 2,959 2,960
Subtotal 8,015 11,373
Reclassified to long-term debt (7,759) (9,825)
Total short-term debt $ 256 $ 1,548
Weighted-average interest rate   0.15%