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Derivative Instruments - Fair Value Table (Detail) (Not Designated as Hedging Instrument [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets $ 116 $ 380
Gross derivative liabilities (1,085) (986)
Derivative assets netting (77) [1] (279) [1]
Derivative liabilities netting 77 [1] 279 [1]
Cash collateral from counterparties 0 0
Cash collateral held by counterparties 13 7
Derivative assets 39 101
Derivative liabilities (995) (700)
Commodity Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets 116 380
Gross derivative liabilities (193) (332)
Interest-Rate and Other Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets 0 0
Gross derivative liabilities (892) (654)
Derivative liabilities netting 0 [1] 0 [1]
Cash collateral held by counterparties 0 0
Derivative liabilities (892) (654)
Financial Institutions [Member] | Commodity Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets netting (73) [1] (153) [1]
Derivative liabilities netting 73 [1] 153 [1]
Cash collateral from counterparties 0 0
Cash collateral held by counterparties 13 7
Derivative assets 17 58
Derivative liabilities (85) (40)
Other Counterparties [Member] | Commodity Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets netting (4) [1] (126) [1]
Derivative liabilities netting 4 [1] 126 [1]
Cash collateral from counterparties 0 0
Cash collateral held by counterparties 0 0
Derivative assets 22 43
Derivative liabilities (18) (6)
Fair Value, Inputs, Level 1 [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets 0 0
Gross derivative liabilities 0 0
Fair Value, Inputs, Level 1 [Member] | Interest-Rate and Other Derivatives [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative liabilities 0 0
Fair Value, Inputs, Level 1 [Member] | Financial Institutions [Member] | Commodity Derivatives [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets 0 0
Gross derivative liabilities 0 0
Fair Value, Inputs, Level 1 [Member] | Other Counterparties [Member] | Commodity Derivatives [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets 0 0
Gross derivative liabilities 0 0
Fair Value, Inputs, Level 2 [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets 116 380
Gross derivative liabilities (1,085) (986)
Fair Value, Inputs, Level 2 [Member] | Interest-Rate and Other Derivatives [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative liabilities (892) (654)
Fair Value, Inputs, Level 2 [Member] | Financial Institutions [Member] | Commodity Derivatives [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets 90 211
Gross derivative liabilities (171) (200)
Fair Value, Inputs, Level 2 [Member] | Other Counterparties [Member] | Commodity Derivatives [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets 26 169
Gross derivative liabilities (22) (132)
Fair Value, Inputs, Level 3 [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets 0 0
Gross derivative liabilities 0 0
Fair Value, Inputs, Level 3 [Member] | Interest-Rate and Other Derivatives [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative liabilities 0 0
Fair Value, Inputs, Level 3 [Member] | Financial Institutions [Member] | Commodity Derivatives [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets 0 0
Gross derivative liabilities 0 0
Fair Value, Inputs, Level 3 [Member] | Other Counterparties [Member] | Commodity Derivatives [Member] | Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross derivative assets 0 0
Gross derivative liabilities $ 0 $ 0
[1] Represents the impact of netting commodity derivative assets and liabilities with counterparties where the Company has the contractual right and intends to net settle.