v2.4.0.8
Derivative Instruments (Details 2) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Derivative assets, current $ 549 $ 445
Long-term derivative assets 295 105
Total derivative assets 844 550
Derivative liabilities, current 534 451
Long-term derivative liabilities 295 243
Total derivative liabilities 829 694
Derivative, Fair Value, Net 15 (144)
Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Total derivative assets 5 9
Total derivative liabilities 108 115
Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Total derivative assets 839 541
Total derivative liabilities 721 579
Interest Rate Swap [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets, current 0 0
Derivative Assets, Noncurrent 5 9
Total derivative assets 5 9
Current derivative liabilities 45 47
Derivative Liabilities, Noncurrent 68 82
Total derivative liabilities 113 129
Derivative, Fair Value, Net (108) (120)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Total derivative assets 5 9
Total derivative liabilities 108 115
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Total derivative assets 0 0
Total derivative liabilities 5 14
Energy Related Derivative [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets, current 549 445
Derivative Assets, Noncurrent 290 96
Total derivative assets 839 541
Current derivative liabilities 489 404
Derivative Liabilities, Noncurrent 227 161
Total derivative liabilities 716 565
Derivative, Fair Value, Net 123 (24)
Energy Related Derivative [Member] | Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Total derivative assets 839 541
Total derivative liabilities $ 716 $ 565