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Derivative Instruments - Additional Information (Detail)
Mcf in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Mcf
Dec. 31, 2014
USD ($)
MBbls / d
Mcf
Dec. 31, 2013
USD ($)
Jan. 23, 2015
USD ($)
Derivative [Line Items]        
Cash received (paid) in settlement of derivative instruments $ 335,000,000 $ 371,000,000 $ 85,000,000  
(Gains) losses on derivatives, net (100,000,000) 207,000,000 (392,000,000)  
Debt instrument, principal amount 17,312,000,000 16,687,000,000    
Cash paid in settlement of interest-rate swap agreements 35,000,000 222,000,000 0  
5.0 billion Facility [Member] | Revolving Credit Facility [Member]        
Derivative [Line Items]        
Line of credit, maximum capacity       $ 5,000,000,000
Senior Notes [Member] | Senior Note 16 And Senior Note 17 [Member]        
Derivative [Line Items]        
Debt instrument, principal amount   1,250,000,000.00    
Interest Rate Swap [Member] | (Gains) Losses on Derivatives, net [Member]        
Derivative [Line Items]        
(Gains) losses on derivatives, net 268,000,000 786,000,000 $ (539,000,000)  
Interest Rate Swap [Member] | Interest Rate Swaps 3 Through 8 [Member] | Modified Interest Rate Swap for Mandatory Termination Dates [Member] | (Gains) Losses on Derivatives, net [Member]        
Derivative [Line Items]        
(Gains) losses on derivatives, net 137,000,000      
Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Gross derivative liability 1,722,000,000 1,455,000,000    
Aggregate fair value of derivative instruments with credit-risk-related contingent features for which a net liability position existed, net of collateral 1,300,000,000 97,000,000    
Not Designated as Hedging Instrument [Member] | Permitted to Offset Gross Derivative Asset with Financial Institutions [Member]        
Derivative [Line Items]        
Gross derivative liability $ 347,000,000 $ 289,000,000    
Not Designated as Hedging Instrument [Member] | Natural Gas [Member] | Commodity [Member]        
Derivative [Line Items]        
Financial derivative transactions | Mcf 8 6    
Not Designated as Hedging Instrument [Member] | Price Risk Derivative [Member] | Terminated or Offset Three-Way Collars Oil 2015 [Member]        
Derivative [Line Items]        
Oil derivative nonmonetary notional amount per day | MBbls / d   25    
Cash received (paid) in settlement of derivative instruments   $ 126,000,000    
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]        
Derivative [Line Items]        
Gross derivative liability $ 1,542,000,000 1,217,000,000    
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]        
Derivative [Line Items]        
Gross derivative liability 1,488,000,000 1,217,000,000    
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Settled Interest Rate Swap [Member]        
Derivative [Line Items]        
Aggregate notional principal amount of interest-rate swap   750,000,000    
Cash paid in settlement of interest-rate swap agreements   $ 222,000,000    
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Interest Rate Swaps 6 Through 8 [Member] | Modified Interest Rate Swaps For Reference Period Date Extensions [Member]        
Derivative [Line Items]        
Aggregate notional principal amount of interest-rate swap 1,000,000,000      
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Interest Rate Swaps 3 Through 8 [Member] | Modified Interest Rate Swap for Mandatory Termination Dates [Member]        
Derivative [Line Items]        
Aggregate notional principal amount of interest-rate swap 1,800,000,000      
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Interest Rate Swaps 3 Through 8 [Member] | Modified Interest Rate Swap for Mandatory Termination Dates [Member] | Other Liabilities [Member]        
Derivative [Line Items]        
Gross derivative liability $ 137,000,000