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Fair Value Measurements (Reconciliation Of Assets 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
6 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Inventories Carried At Market [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period $ 1,462 $ 1,745
Total increase (decrease) in unrealized gains included in cost of products sold 78 (645)
Purchases 4,866 14,638
Sales (4,746) (14,107)
Transfers into Level 3 278 231
Transfers out of Level 3 (193) (50)
Balance at end of period 1,745 1,812
Commodity Derivative Contracts Gains [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period 171 143
Total increase (decrease) in unrealized gains included in cost of products sold 127 474
Purchases 0  
Settlements (231) (567)
Transfers into Level 3 161 323
Transfers out of Level 3 (85) (94)
Balance at end of period 143 279
Total Assets [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period 1,633 1,888
Total increase (decrease) in unrealized gains included in cost of products sold 205 (171)
Purchases 4,866 14,638
Sales (4,746) (14,107)
Settlements (231) (567)
Transfers into Level 3 439 554
Transfers out of Level 3 (278) (144)
Balance at end of period $ 1,888 $ 2,091