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FINANCIAL INSTRUMENTS - Summary of Fair Value of Derivative Instruments Using Level 2 Inputs (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative assets $ 408 $ 319
Counterparty and Cash Collateral Netting, Assets (160) (158)
Net Asset Included in Balance Sheet 248 161
Derivative liabilities 446 591
Counterparty and Cash Collateral Netting, Liabilities (155) (172)
Derivative Liability 291 419
Cash collateral 26 26
Derivatives designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative assets 163 141
Counterparty and Cash Collateral Netting, Assets (58) (55)
Net Asset Included in Balance Sheet 105 86
Derivative liabilities 307 352
Counterparty and Cash Collateral Netting, Liabilities (69) (73)
Derivative Liability 238 279
Derivatives designated as hedging instruments | Interest rates | Other noncurrent obligations    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 64 4
Counterparty and Cash Collateral Netting, Liabilities 0 0
Derivative Liability 64 4
Derivatives designated as hedging instruments | Foreign currency contracts | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 98 51
Counterparty and Cash Collateral Netting, Assets (42) (46)
Net Asset Included in Balance Sheet 56 5
Derivatives designated as hedging instruments | Foreign currency contracts | Accrued and other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 46 109
Counterparty and Cash Collateral Netting, Liabilities (42) (46)
Derivative Liability 4 63
Derivatives designated as hedging instruments | Commodities | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 47 20
Counterparty and Cash Collateral Netting, Assets (13) (4)
Net Asset Included in Balance Sheet 34 16
Derivatives designated as hedging instruments | Commodities | Deferred charges and other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 18 70
Counterparty and Cash Collateral Netting, Assets (3) (5)
Net Asset Included in Balance Sheet 15 65
Derivatives designated as hedging instruments | Commodities | Accrued and other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 111 96
Counterparty and Cash Collateral Netting, Liabilities (18) (15)
Derivative Liability 93 81
Derivatives designated as hedging instruments | Commodities | Other noncurrent obligations    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 86 143
Counterparty and Cash Collateral Netting, Liabilities (9) (12)
Derivative Liability 77 131
Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative assets 245 178
Counterparty and Cash Collateral Netting, Assets (102) (103)
Net Asset Included in Balance Sheet 143 75
Derivative liabilities 139 239
Counterparty and Cash Collateral Netting, Liabilities (86) (99)
Derivative Liability 53 140
Derivatives not designated as hedging instruments | Foreign currency contracts | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 200 121
Counterparty and Cash Collateral Netting, Assets (99) (95)
Net Asset Included in Balance Sheet 101 26
Derivatives not designated as hedging instruments | Foreign currency contracts | Accrued and other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 124 186
Counterparty and Cash Collateral Netting, Liabilities (79) (90)
Derivative Liability 45 96
Derivatives not designated as hedging instruments | Commodities | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 41 50
Counterparty and Cash Collateral Netting, Assets (1) (5)
Net Asset Included in Balance Sheet 40 45
Derivatives not designated as hedging instruments | Commodities | Deferred charges and other assets    
Derivatives, Fair Value [Line Items]    
Derivative assets 4 7
Counterparty and Cash Collateral Netting, Assets (2) (3)
Net Asset Included in Balance Sheet 2 4
Derivatives not designated as hedging instruments | Commodities | Accrued and other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 7 45
Counterparty and Cash Collateral Netting, Liabilities (4) (6)
Derivative Liability 3 39
Derivatives not designated as hedging instruments | Commodities | Other noncurrent obligations    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 8 8
Counterparty and Cash Collateral Netting, Liabilities (3) (3)
Derivative Liability 5 5
Individually Immaterial Counterparties    
Derivatives, Fair Value [Line Items]    
Cash collateral $ 54 $ 0