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Derivative Instruments - Additional Information (Detail)
Mcf in Millions
3 Months Ended 12 Months Ended
May. 02, 2016
USD ($)
Apr. 25, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mcf
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Mcf
Derivative [Line Items]          
Debt instrument, principal amount     $ 20,411,000,000   $ 17,312,000,000
Net cash paid in settlement of derivative instruments     105,000,000 $ 91,000,000  
Anadarko Excluding WES and WGP [Member]          
Derivative [Line Items]          
Debt instrument, principal amount [1]     17,333,000,000   14,592,000,000
Senior Notes 1 Through 3 [Member] | Anadarko Excluding WES and WGP [Member] | Senior Notes [Member]          
Derivative [Line Items]          
Debt instrument, principal amount     $ 3,000,000,000    
5.950% Senior Notes Due 2016 [Member] | Anadarko Excluding WES and WGP [Member] | Senior Notes [Member]          
Derivative [Line Items]          
Debt instrument, stated interest rate     5.95%    
Debt instrument, maturity date     Sep. 15, 2016    
5.950% Senior Notes Due 2016 [Member] | Anadarko Excluding WES and WGP [Member] | Subsequent Event [Member] | Senior Notes [Member]          
Derivative [Line Items]          
Senior notes redeemed $ 1,750,000,000        
Debt instrument, stated interest rate 5.95%        
Debt instrument, maturity date Sep. 15, 2016        
6.375% Senior Notes Due 2017 [Member] | Anadarko Excluding WES and WGP [Member] | Senior Notes [Member]          
Derivative [Line Items]          
Debt instrument, principal amount     $ 2,000,000,000    
Debt instrument, stated interest rate     6.375%    
Debt instrument, maturity date     Sep. 15, 2017    
6.375% Senior Notes Due 2017 [Member] | Anadarko Excluding WES and WGP [Member] | Subsequent Event [Member] | Senior Notes [Member]          
Derivative [Line Items]          
Debt instrument, principal amount   $ 2,000,000,000      
Debt instrument, stated interest rate   6.375%      
Debt instrument, maturity date   Sep. 15, 2017      
Portion of 6.375% Senior Notes Due 2017 [Member] | Anadarko Excluding WES and WGP [Member] | Subsequent Event [Member] | Senior Notes [Member]          
Derivative [Line Items]          
Senior notes redeemed   $ 1,250,000,000      
Total Amount of Senior Notes Due in 2019 [Member] | Senior Notes [Member]          
Derivative [Line Items]          
Debt instrument, principal amount     $ 900,000,000    
Zero-Coupon Senior Notes [Member] | Anadarko Excluding WES and WGP [Member] | Senior Notes [Member]          
Derivative [Line Items]          
Debt instrument, maturity date     Oct. 10, 2036    
Debt Instrument, earliest call date     Oct. 10, 2016    
Zero-Coupon Senior Notes [Member] | Anadarko Excluding WES and WGP [Member] | Senior Notes [Member] | Accreted Value at Next Potential Put Date [Member]          
Derivative [Line Items]          
Debt instrument, accreted value     $ 839,000,000    
Not Designated as Hedging Instrument [Member]          
Derivative [Line Items]          
Gross derivative liabilities     1,758,000,000   1,722,000,000
Cash collateral held by counterparties     421,000,000   58,000,000
Aggregate fair value of derivative instruments with credit-risk-related contingent features for which a net liability position existed (net of collateral)     1,100,000,000   1,300,000,000
Not Designated as Hedging Instrument [Member] | Cash Collateral Posted Excluding Interest [Member]          
Derivative [Line Items]          
Cash collateral held by counterparties     420,000,000   58,000,000
Not Designated as Hedging Instrument [Member] | Permitted to Offset Gross Derivative Asset with Financial Institutions [Member]          
Derivative [Line Items]          
Gross derivative liabilities     238,000,000   347,000,000
Not Designated as Hedging Instrument [Member] | Interest-Rate Derivatives [Member]          
Derivative [Line Items]          
Gross derivative liabilities     1,640,000,000   1,542,000,000
Cash collateral held by counterparties     421,000,000   58,000,000
Not Designated as Hedging Instrument [Member] | Interest-Rate Derivatives [Member] | Other Liabilities [Member]          
Derivative [Line Items]          
Gross derivative liabilities     1,550,000,000   $ 1,488,000,000
Not Designated as Hedging Instrument [Member] | Interest-Rate Derivatives [Member] | Settled Interest Rate Swap [Member]          
Derivative [Line Items]          
Net cash paid in settlement of derivative instruments     193,000,000    
Not Designated as Hedging Instrument [Member] | Interest-Rate Derivatives [Member] | Interest Rate Swaps 1 Through 7 [Member]          
Derivative [Line Items]          
Notional principal amount of interest-rate swap     $ 1,700,000,000    
Not Designated as Hedging Instrument [Member] | Interest-Rate Derivatives [Member] | Interest Rate Swaps 3 and 5 [Member] | Modified Interest-Rate Swaps for Mandatory Termination Dates [Member]          
Derivative [Line Items]          
Mandatory termination date for interest-rate swap prior to modification     Sep. 15, 2021    
Notional principal amount of interest-rate swap     $ 500,000,000    
Natural Gas [Member] | Commodity [Member] | Not Designated as Hedging Instrument [Member]          
Derivative [Line Items]          
Financial derivative transactions | Mcf     4   8
[1] Excludes WES and WGP.