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Fair Value Measurements (Reconciliation Of Liabilities Measured At Fair Value On A Recurring Basis) (Details) (Significant Unobservable Inputs (Level 3) [Member], Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Liabilities [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unrealized losses on derivative liabilities $ 8   $ 110  
Inventory Related Payables [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance at beginning of period 216 137 33 196
Total increase (decrease) in unrealized losses included in cost of products sold (161) [1] 0 (151) [2] 0
Purchases 10 0 186 0
Sales (2) (86) (6) (4)
Settlements 0 0 0 0
Transfers into Level 3 0 2 1 2
Transfers out of Level 3 0 (15) 0 (156)
Balance at end of period 63 38 63 38
Commodity Derivative Contracts Losses [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance at beginning of period 171 184 138 192
Total increase (decrease) in unrealized losses included in cost of products sold 137 [1] 90 255 [2] 249
Purchases 0 (1) 0 (1)
Sales 0 0 0 0
Settlements (109) (104) (211) (245)
Transfers into Level 3 51 41 74 53
Transfers out of Level 3 (17) (31) (23) (69)
Balance at end of period 233 179 233 179
Total Liabilities [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance at beginning of period 387 321 171 388
Total increase (decrease) in unrealized losses included in cost of products sold (24) [1] 90 104 [2] 249
Purchases 10 (1) 186 (1)
Sales (2) (86) (6) (4)
Settlements (109) (104) (211) (245)
Transfers into Level 3 51 43 75 55
Transfers out of Level 3 (17) (46) (23) (225)
Balance at end of period $ 296 $ 217 $ 296 $ 217
[1] Includes losses of $8 million that are attributable to the change in unrealized losses relating to Level 3 liabilities still held at June 30, 2013.
[2] Includes losses of $110 million that are attributable to the change in unrealized losses relating to Level 3 liabilities still held at June 30, 2013.