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DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Fair Value Derivative Balance Sheet Location (Details) - Designated as Hedging Instrument - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Current maturities of long-term debt, commercial paper and finance leases | Carrying Amount |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | $ 1,000 | $ 0
Current maturities of long-term debt, commercial paper and finance leases | Fair Value |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 0 | 0
Long-term debt and finance leases | Carrying Amount |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 3,218 | 4,207
Long-term debt and finance leases | Fair Value |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | $ 27 | $ 16

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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
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