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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

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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