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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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 $ 455 $ 265 $ 368 $ 220
Purchases 179 546 521 1,027
Sales (250) (485) (499) (795)
Issuances (7) (43) (7) (327)
Settlements 93 176 28 158
Transfers into Level 3 165 167 300 312
Transfers out of Level 3 (19) (72) (26) (153)
Balance at end of period 856 745 856 745
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 240 191 171 303
Changes in unrealized gains and (losses) relating to assets and liabilities 131 18 11 15
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 16 79 167 (2)
Purchases   1   1
Issuances     (1)  
Settlements (6) (29) (72) (47)
Transfers into Level 3 (2) (1) (2)  
Transfers out of Level 3 3 (9) 3 (3)
Balance at end of period 127 192 127 192
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 116 151 32 243
Changes in unrealized gains and (losses) relating to assets and liabilities 83 23 20 17
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 730 675 245 255
Purchases 196 545 733 1,027
Sales (250) (485) (499) (795)
Issuances (7)   (6)  
Transfers into Level 3 168 199 361 515
Transfers out of Level 3 (41) (63) (48) (151)
Balance at end of period 917 910 917 910
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 121 39 131 59
Changes in unrealized gains and (losses) relating to assets and liabilities 51 (6) (7) 1
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 (291) (489) (44) (33)
Purchases (17)   (212) (1)
Issuances   (43)   (327)
Settlements 99 205 100 205
Transfers into Level 3 (1) (31) (59) (203)
Transfers out of Level 3 19   19 1
Balance at end of period (188) (357) (188) (357)
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 3 1 8 1
Changes in unrealized gains and (losses) relating to assets and liabilities $ (3) $ 1 $ (2) $ (3)