v3.3.0.814
Derivative Instruments (Details 2) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative assets, current $ 1,429 $ 2,058
Long-term derivative assets 718 439
Total derivative assets 2,147 2,497
Derivative liabilities, current 1,334 1,782
Long-term derivative liabilities 501 444
Total derivative liabilities 1,835 2,226
Derivative, Fair Value, Net 312 271
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative assets 2 4
Total derivative liabilities 111 112
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative assets 2,145 2,493
Total derivative liabilities 1,724 2,114
Interest Rate Swap [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, current 0 0
Derivative Assets, Noncurrent 2 4
Total derivative assets 2 4
Current derivative liabilities 41 44
Derivative Liabilities, Noncurrent 69 70
Total derivative liabilities 110 114
Derivative, Fair Value, Net (108) (110)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative assets 2 4
Total derivative liabilities 111 112
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative assets 0 0
Total derivative liabilities (1) 2
Energy Related Derivative [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets, current 1,429 2,058
Derivative Assets, Noncurrent 716 435
Total derivative assets 2,145 2,493
Current derivative liabilities 1,293 1,738
Derivative Liabilities, Noncurrent 432 374
Total derivative liabilities 1,725 2,112
Derivative, Fair Value, Net 420 381
Energy Related Derivative [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Total derivative assets 2,145 2,493
Total derivative liabilities $ 1,725 $ 2,112