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Debt and Interest Expense - Additional Information (Detail) - USD ($)
3 Months Ended
Jan. 19, 2016
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Debt instrument, principal amount   $ 20,411,000,000 $ 17,312,000,000
Short-term debt   3,025,000,000 32,000,000
Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Debt instrument, principal amount [1]   17,333,000,000 14,592,000,000
Short-term debt [1]   3,025,000,000 32,000,000
Western Gas Partners, LP [Member]      
Debt Instrument [Line Items]      
Debt instrument, principal amount   3,050,000,000 2,720,000,000
Short-term debt   0 0
Western Gas Equity Partners, LP excluding WES [Member]      
Debt Instrument [Line Items]      
Debt instrument, principal amount [2]   28,000,000 0
Short-term debt [2]   0 0
Commercial Paper [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Line of credit, maximum capacity   3,000,000,000  
Commercial paper, outstanding borrowings   $ 0  
Commercial Paper [Member] | Maximum [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Debt instrument, term   397 days  
Fair Value, Inputs, Level 2 [Member] | Market Approach Valuation Technique [Member]      
Debt Instrument [Line Items]      
Estimated fair value of total borrowings   $ 18,900,000,000 $ 15,700,000,000
5.950% Senior Notes Due 2016 [Member] | Senior Notes [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Short-term debt   $ 1,750,000,000  
Debt instrument, stated interest rate   5.95%  
Debt instrument, maturity date   Sep. 15, 2016  
Portion of 6.375% Senior Notes Due 2017 [Member] | Senior Notes [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Short-term debt   $ 1,250,000,000  
6.375% Senior Notes Due 2017 [Member] | Senior Notes [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Debt instrument, principal amount   $ 2,000,000,000  
Debt instrument, stated interest rate   6.375%  
Debt instrument, maturity date   Sep. 15, 2017  
Senior Notes 1 Through 3 [Member] | Senior Notes [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Debt instrument, principal amount   $ 3,000,000,000  
Zero-Coupon Senior Notes [Member] | Senior Notes [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Debt instrument, maturity date   Oct. 10, 2036  
Debt Instrument, earliest call date   Oct. 10, 2016  
Zero-Coupon Senior Notes [Member] | Senior Notes [Member] | Accreted Value at Next Potential Put Date [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Debt instrument, accreted value   $ 839,000,000  
Five-Year Credit Facility [Member] | Revolving Credit Facility [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Line of credit, maximum capacity   $ 3,000,000,000  
Debt instrument, term   5 years  
Line of credit, expiration date   Jan. 23, 2021  
Line of credit, outstanding borrowings   $ 0  
364-Day Credit Facility due 2016 [Member] | Revolving Credit Facility [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Line of credit, maximum capacity $ 2,000,000,000    
Debt instrument, term 364 days    
364-Day Credit Facility due 2017 [Member] | Revolving Credit Facility [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Line of credit, maximum capacity   $ 2,000,000,000  
Debt instrument, term   364 days  
Line of credit, expiration date   Jan. 15, 2017  
Line of credit, outstanding borrowings   $ 0  
WES RCF [Member] | Revolving Credit Facility [Member] | Western Gas Partners, LP [Member]      
Debt Instrument [Line Items]      
Line of credit, maximum capacity   $ 1,200,000,000  
Debt instrument, term   5 years  
Line of credit, expiration date   Feb. 26, 2019  
Line of credit, expandable maximum capacity   $ 1,500,000,000  
Line of credit, outstanding borrowings   $ 630,000,000  
Line of credit, interest rate   1.74%  
Letters of credit, outstanding   $ 5,000,000  
Line of credit, available borrowing capacity   565,000,000  
WGP RCF [Member] | Revolving Credit Facility [Member] | Western Gas Equity Partners, LP excluding WES [Member]      
Debt Instrument [Line Items]      
Line of credit, maximum capacity   $ 250,000,000  
Debt instrument, term   3 years  
Line of credit, expiration date   Mar. 14, 2019  
Line of credit, expandable maximum capacity   $ 500,000,000  
Line of credit, outstanding borrowings   $ 28,000,000  
Line of credit, interest rate   2.69%  
Line of credit, available borrowing capacity   $ 222,000,000  
WGP RCF [Member] | Revolving Credit Facility [Member] | Western Gas Equity Partners, LP excluding WES [Member] | Percentage Above Federal Funds Effective Rate [Member] | Alternate Base Rate [Member]      
Debt Instrument [Line Items]      
Applicable margin added   0.50%  
WGP RCF [Member] | Revolving Credit Facility [Member] | Western Gas Equity Partners, LP excluding WES [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Line of credit, variable rate floor   0.00%  
WGP RCF [Member] | Revolving Credit Facility [Member] | Western Gas Equity Partners, LP excluding WES [Member] | London Interbank Offered Rate (LIBOR) [Member] | Alternate Base Rate [Member]      
Debt Instrument [Line Items]      
Applicable margin added   1.00%  
WGP RCF [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Western Gas Equity Partners, LP excluding WES [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Applicable margin added   2.00%  
WGP RCF [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Western Gas Equity Partners, LP excluding WES [Member] | Base Rate [Member]      
Debt Instrument [Line Items]      
Applicable margin added   1.00%  
WGP RCF [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Western Gas Equity Partners, LP excluding WES [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Applicable margin added   2.75%  
WGP RCF [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Western Gas Equity Partners, LP excluding WES [Member] | Base Rate [Member]      
Debt Instrument [Line Items]      
Applicable margin added   1.75%  
[1] Excludes WES and WGP.
[2] Excludes WES.