v3.3.1.900
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - RECONCILIATION FOR ASSETS AND LIABILITIES MEASURE AT FAIR VALUE USING LEVEL 3 (DETAILS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)    
Balance at beginning of period $ 220 $ 243
Total gains and (losses) realized/unrealized included in cost of goods sold 518 165
Purchases 1,318 2,105
Sales (1,982) (2,627)
Issuances (328) (381)
Settlements 391 322
Transfers into Level 3 646 703
Transfers out of Level 3 (415) (310)
Balance at end of period 368 220
Cost of goods sold.    
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)    
Changes in unrealized gains and (losses) relating to assets and liabilities 22 (8)
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 (2) 20
Total gains and (losses) realized/unrealized included in cost of goods sold 389 92
Purchases 1 6
Issuances (1) 19
Settlements (219) (206)
Transfers into Level 3 5 27
Transfers out of Level 3 (6) 40
Balance at end of period 167 (2)
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)    
Changes in unrealized gains and (losses) relating to assets and liabilities 37 25
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 255 298
Total gains and (losses) realized/unrealized included in cost of goods sold 135 75
Purchases 1,329 2,104
Sales (1,982) (2,635)
Transfers into Level 3 845 687
Transfers out of Level 3 (337) (274)
Balance at end of period 245 255
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)    
Changes in unrealized gains and (losses) relating to assets and liabilities (13) (33)
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 (33) (75)
Total gains and (losses) realized/unrealized included in cost of goods sold (6) (2)
Purchases (12) (5)
Sales   8
Issuances (327) (400)
Settlements 610 528
Transfers into Level 3 (204) (11)
Transfers out of Level 3 (72) (76)
Balance at end of period (44) $ (33)
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)    
Changes in unrealized gains and (losses) relating to assets and liabilities $ (2)