v3.5.0.2
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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)        
Balance at beginning of period $ 856 $ 745 $ 368 $ 220
Purchases 163 165 684 1,193
Sales (517) (647) (1,022) (1,442)
Issuances     (1) (328)
Settlements 58 170 85 327
Transfers into Level 3 203 166 503 480
Transfers out of Level 3 (449) (145) (475) (298)
Balance at end of period 213 762 213 762
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 (101) 308 71 610
Changes in unrealized gains and (losses) relating to assets and liabilities (137) (31) (16) 31
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 127 192 167 (2)
Purchases       1
Issuances     (1)  
Settlements (37) (91) (110) (139)
Transfers into Level 3 (5) (1) (7)  
Transfers out of Level 3 (1)   2 (3)
Balance at end of period (36) 317 (36) 317
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 (120) 217 (87) 460
Changes in unrealized gains and (losses) relating to assets and liabilities (127) (35) 9 18
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 917 910 245 255
Purchases 171 170 904 1,197
Sales (517) (647) (1,022) (1,442)
Transfers into Level 3 208 167 569 683
Transfers out of Level 3 (499) (98) (547) (249)
Balance at end of period 292 611 292 611
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 12 109 143 167
Changes in unrealized gains and (losses) relating to assets and liabilities (12) 24 (26) 15
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 (188) (357) (44) (33)
Purchases (8) (5) (220) (5)
Issuances       (328)
Settlements 95 261 195 466
Transfers into Level 3     (59) (203)
Transfers out of Level 3 51 (47) 70 (46)
Balance at end of period (43) (166) (43) (166)
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 7 (18) 15 (17)
Changes in unrealized gains and (losses) relating to assets and liabilities $ 2 $ (20) $ 1 $ (2)