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Debt and Interest Expense - Debt Activity Table (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Debt Instrument [Line Items]  
Balance at December 31, 2015 $ 15,648 [1]
Other, net 41
Balance at September 30, 2016 15,633 [1]
Western Gas Partners, LP [Member]  
Debt Instrument [Line Items]  
Balance at December 31, 2015 2,691 [1]
Other, net 1
Balance at September 30, 2016 2,907 [1]
Western Gas Equity Partners, LP excluding WES [Member]  
Debt Instrument [Line Items]  
Balance at December 31, 2015 0 [1],[2]
Other, net 0 [2]
Balance at September 30, 2016 28 [1],[2]
Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Balance at December 31, 2015 12,957 [1],[3]
Other, net 40 [3]
Balance at September 30, 2016 12,698 [1],[3]
364-Day Credit Facility Due 2017 [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 1,750
Repayments, credit facility (1,750)
364-Day Credit Facility Due 2017 [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 1,750 [3]
Repayments, credit facility (1,750) [3]
WES RCF [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 600
Repayments, credit facility (880)
WES RCF [Member] | Western Gas Partners, LP [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 600
Repayments, credit facility (880)
WGP RCF [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 28
WGP RCF [Member] | Western Gas Equity Partners, LP excluding WES [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 28 [2]
Commercial Paper [Member]  
Debt Instrument [Line Items]  
Repayments, commercial paper (250)
Commercial Paper [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Repayments, commercial paper (250) [3]
4.850% Senior Notes Due 2021 [Member]  
Debt Instrument [Line Items]  
Issuances $ 794
Debt instrument, stated interest rate 4.85%
Debt instrument, maturity date Mar. 15, 2021
4.850% Senior Notes Due 2021 [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Issuances $ 794 [3]
5.550% Senior Notes Due 2026 [Member]  
Debt Instrument [Line Items]  
Issuances $ 1,088
Debt instrument, stated interest rate 5.55%
Debt instrument, maturity date Mar. 15, 2026
5.550% Senior Notes Due 2026 [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Issuances $ 1,088 [3]
6.600% Senior Notes Due 2046 [Member]  
Debt Instrument [Line Items]  
Issuances $ 1,088
Debt instrument, stated interest rate 6.60%
Debt instrument, maturity date Mar. 15, 2046
6.600% Senior Notes Due 2046 [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Issuances $ 1,088 [3]
WES 4.650% Senior Notes Due 2026 [Member]  
Debt Instrument [Line Items]  
Issuances $ 495
Debt instrument, stated interest rate 4.65%
Debt instrument, maturity date Jul. 15, 2026
WES 4.650% Senior Notes Due 2026 [Member] | Western Gas Partners, LP [Member]  
Debt Instrument [Line Items]  
Issuances $ 495
5.950% Senior Notes Due 2016 [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes $ (1,749)
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]  
Debt Instrument [Line Items]  
Repayments, senior notes $ (1,749) [3]
Portion of 6.375% Senior Notes Due 2017 [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes (1,245)
Portion of 6.375% Senior Notes Due 2017 [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes (1,245) [3]
Senior Note Component of 7.50% Tangible Equity Units [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes $ (25)
Debt instrument, stated interest rate 1.50%
Debt instrument, maturity date Jun. 07, 2018
Senior Note Component of 7.50% Tangible Equity Units [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes $ (25) [3]
[1] The Company’s outstanding borrowings, except for borrowings under the WGP revolving credit facility, are senior unsecured.
[2] Excludes WES.
[3] Excludes WES and WGP.