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Short-Term Debt - Sumamry (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Short term borrowings    
Commercial paper $ 7,503 $ 5,379
Notes payable to banks and others with originating terms of one year or less 28 0
Current maturities of long-term debt 4,999 6,720
Current maturities of long-term capital leases 18 15
Redeemable long term obligations - Long-term debt 3,078 3,078
Redeemable long term obligations - Capital leases 0 0
Subtotal 15,626 15,192
Reclassified to long-term debt (9,900) (10,000)
Total short-term debt $ 5,726 $ 5,192
Weighted-average interest rate 2.43% 1.30%
Unamortized discounts and debt issuance costs $ 1 $ 2