v3.4.0.3
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
Mar. 31, 2016
Mar. 31, 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 $ 368 $ 220
Purchases 342 481
Sales (248) (310)
Issuances   (285)
Settlements (66) (18)
Transfers into Level 3 135 146
Transfers out of Level 3 (7) (81)
Balance at end of period 455 265
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 (69) 112
Changes in unrealized gains and (losses) relating to assets and liabilities (102) 1
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 167 (2)
Settlements (66) (18)
Transfers into Level 3   1
Transfers out of Level 3   6
Balance at end of period 16 79
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 (85) 92
Changes in unrealized gains and (losses) relating to assets and liabilities (79) 21
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 245 255
Purchases 537 482
Sales (248) (310)
Transfers into Level 3 192 316
Transfers out of Level 3 (7) (88)
Balance at end of period 730 675
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 11 20
Changes in unrealized gains and (losses) relating to assets and liabilities (24) (20)
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 (44) (33)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Purchases (195) (1)
Issuances   (285)
Transfers into Level 3 (57) (171)
Transfers out of Level 3   1
Balance at end of period (291) $ (489)
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 5  
Changes in unrealized gains and (losses) relating to assets and liabilities $ 1