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Fair Value Measurements, Recurring (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Assets:    
Commodity derivative contracts $ 1,376 $ 537
Foreign currency contracts 8  
Investments of certain benefit plans 112 109
Total gross fair value, assets 1,496 646
Effect of Counterparty Netting (1,222) (505)
Effect of Cash Collateral Netting (84) (7)
Commodity derivative contracts, net assets 70 25
Net Carrying Value on Balance Sheet, Assets 190 134
Cash Collateral Received Not Offset 0 0
Liabilities:    
Commodity derivative contracts 1,236 516
Biofuels blending obligation 8 11
Physical purchase contracts 17 5
Foreign currency contracts   8
Total gross fair value, liabilities 1,261 540
Effect of Counterparty Netting (1,222) (505)
Effect of Cash Collateral Netting (14) (6)
Commodity derivative contracts, net liabilities 0 5
Net Carrying Value on Balance Sheet, Liabilities 25 29
Cash Collateral Paid Not Offset (49) (76)
Fair Value, Inputs, Level 1 [Member]
    
Assets:    
Commodity derivative contracts 1,334 499
Foreign currency contracts 8  
Investments of certain benefit plans 101 98
Total gross fair value, assets 1,443 597
Liabilities:    
Commodity derivative contracts 1,185 492
Biofuels blending obligation 0 0
Physical purchase contracts 0 0
Foreign currency contracts   8
Total gross fair value, liabilities 1,185 500
Fair Value, Inputs, Level 2 [Member]
    
Assets:    
Commodity derivative contracts 42 38
Foreign currency contracts 0  
Investments of certain benefit plans 0 0
Total gross fair value, assets 42 38
Liabilities:    
Commodity derivative contracts 51 24
Biofuels blending obligation 8 11
Physical purchase contracts 17 5
Foreign currency contracts   0
Total gross fair value, liabilities 76 40
Fair Value, Inputs, Level 3 [Member]
    
Assets:    
Commodity derivative contracts 0 0
Foreign currency contracts 0  
Investments of certain benefit plans 11 11
Total gross fair value, assets 11 11
Liabilities:    
Commodity derivative contracts 0 0
Biofuels blending obligation 0 0
Physical purchase contracts 0 0
Foreign currency contracts   0
Total gross fair value, liabilities $ 0 $ 0