v3.7.0.1
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - RECONCILIATION FOR ASSETS AND LIABILITIES MEASURE AT FAIR VALUE USING LEVEL 3 (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)        
Balance at beginning of period $ 299 $ 455 $ 142 $ 368
Purchases 256 179 694 521
Sales (658) (250) (1,030) (499)
Issuances (3) (7) (5) (7)
Settlements 145 93 162 28
Transfers into Level 3 103 165 279 300
Transfers out of Level 3 (89) (19) (123) (26)
Balance at end of period 170 856 170 856
Cost of goods sold        
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)        
Total gains and losses (realized/unrealized) included in cost of goods sold 117 240 51 171
Changes in unrealized gains and (losses) relating to assets and liabilities 26 131 (15) 11
Derivatives, Net        
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)        
Balance at beginning of period (72) 16 (51) 167
Purchases 1   5  
Issuances (3)   (5) (1)
Settlements 54 (6) 71 (72)
Transfers into Level 3 (3) (2) (7) (2)
Transfers out of Level 3 (4) 3 19 3
Balance at end of period   127   127
Derivatives, Net | Cost of goods sold        
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)        
Total gains and losses (realized/unrealized) included in cost of goods sold 27 116 (32) 32
Changes in unrealized gains and (losses) relating to assets and liabilities 5 83 (9) 20
Readily Marketable Inventories        
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)        
Balance at beginning of period 743 730 237 245
Purchases 380 196 1,144 733
Sales (658) (250) (1,030) (499)
Issuances   (7)   (6)
Transfers into Level 3 157 168 341 361
Transfers out of Level 3 (85) (41) (141) (48)
Balance at end of period 623 917 623 917
Readily Marketable Inventories | Cost of goods sold        
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)        
Total gains and losses (realized/unrealized) included in cost of goods sold 86 121 72 131
Changes in unrealized gains and (losses) relating to assets and liabilities 22 51 (9) (7)
Trade Accounts Receivable/Payable, Net        
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)        
Balance at beginning of period (372) (291) (44) (44)
Purchases (125) (17) (455) (212)
Settlements 91 99 91 100
Transfers into Level 3 (51) (1) (55) (59)
Transfers out of Level 3   19 (1) 19
Balance at end of period (453) (188) (453) (188)
Trade Accounts Receivable/Payable, Net | Cost of goods sold        
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)        
Total gains and losses (realized/unrealized) included in cost of goods sold 4 3 11 8
Changes in unrealized gains and (losses) relating to assets and liabilities $ (1) $ (3) $ 3 $ (2)