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Fair Value Measurements, Recurring (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Assets:    
Commodity derivative contracts $ 719 $ 682
Foreign currency contracts   3
Investments of certain benefit plans 72 75
Total gross fair value, assets 791 760
Effect of Counterparty Netting (681) (557)
Effect of Cash Collateral Netting (21) (12)
Commodity derivative contracts, net assets 17 113
Net Carrying Value on Balance Sheet, Assets 89 191
Cash Collateral Received Not Offset 0 0
Liabilities:    
Commodity derivative contracts 740 557
Environmental credit obligations 20 2
Physical purchase contracts 5 6
Foreign currency contracts 3  
Total gross fair value, liabilities 768 565
Effect of Counterparty Netting (681) (557)
Effect of Cash Collateral Netting (59) 0
Commodity derivative contracts, net liabilities 0 0
Net Carrying Value on Balance Sheet, Liabilities 28 8
Cash Collateral Paid Not Offset (120) (31)
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Commodity derivative contracts 702 649
Foreign currency contracts   3
Investments of certain benefit plans 61 64
Total gross fair value, assets 763 716
Liabilities:    
Commodity derivative contracts 722 522
Environmental credit obligations 0 0
Physical purchase contracts 0 0
Foreign currency contracts 3  
Total gross fair value, liabilities 725 522
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Commodity derivative contracts 17 33
Foreign currency contracts   0
Investments of certain benefit plans 0 0
Total gross fair value, assets 17 33
Liabilities:    
Commodity derivative contracts 18 35
Environmental credit obligations 20 2
Physical purchase contracts 5 6
Foreign currency contracts 0  
Total gross fair value, liabilities 43 43
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
Environmental credit obligations 0 0
Physical purchase contracts 0 0
Foreign currency contracts 0  
Total gross fair value, liabilities $ 0 $ 0