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Risk Management Fair Value of Derivative Contracts (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Derivatives designated as hedging contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net $ 1,103 $ 987
Derivative Liability, Fair Value, Net (90) (74)
Derivatives not designated as hedging contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 1,172 1,024
Derivative Liability, Fair Value, Net (100) (108)
Natural gas and crude derivative contracts | Derivatives designated as hedging contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 316 603
Derivative Liability, Fair Value, Net (56) (13)
Natural gas and crude derivative contracts | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 177 359
Natural gas and crude derivative contracts | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Net (38) (13)
Natural gas and crude derivative contracts | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 139 244
Natural gas and crude derivative contracts | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Net (18) 0
Natural gas and crude derivative contracts | Derivatives not designated as hedging contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 7 35
Derivative Liability, Fair Value, Net (10) (1)
Natural gas and crude derivative contracts | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 7 35
Natural gas and crude derivative contracts | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Net (10) (1)
Interest rate swap agreements | Derivatives designated as hedging contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 774 384
Derivative Liability, Fair Value, Net 0 (9)
Interest rate swap agreements | Derivatives not designated as hedging contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 62 1
Derivative Liability, Fair Value, Net 0 (16)
Interest rate swap agreements | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 12 1
Interest rate swap agreements | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Net 0 (11)
Interest rate swap agreements | Derivatives not designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 50 0
Interest rate swap agreements | Derivatives not designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Net 0 (5)
Cross-currency swap agreements | Derivatives designated as hedging contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 13 0
Derivative Liability, Fair Value, Net (34) (52)
Power derivative contracts | Derivatives not designated as hedging contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 0 1
Derivative Liability, Fair Value, Net 0 (17)
Power derivative contracts | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 0 1
Power derivative contracts | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Net 0 (17)
Commodity Contract [Member] | Derivatives not designated as hedging contracts    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 69 37
Derivative Liability, Fair Value, Net (10) (34)
Fair Value Hedging [Member] | Interest rate swap agreements | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 117 111
Fair Value Hedging [Member] | Interest rate swap agreements | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Net 0 0
Fair Value Hedging [Member] | Interest rate swap agreements | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 657 273
Fair Value Hedging [Member] | Interest rate swap agreements | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Net 0 (9)
Fair Value Hedging [Member] | Cross-currency swap agreements | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 0 0
Fair Value Hedging [Member] | Cross-currency swap agreements | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Net (22) (6)
Fair Value Hedging [Member] | Cross-currency swap agreements | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net 13 0
Fair Value Hedging [Member] | Cross-currency swap agreements | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Net $ (12) $ (46)