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Debt and Interest Expense - Debt Activity Table (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Debt Instrument [Line Items]  
Balance at December 31, 2015 $ 15,648
Other, net 13
Balance at March 31, 2016 18,731
Western Gas Partners, LP [Member]  
Debt Instrument [Line Items]  
Balance at December 31, 2015 2,691
Other, net 0
Balance at March 31, 2016 3,021
Western Gas Equity Partners, LP excluding WES [Member]  
Debt Instrument [Line Items]  
Balance at December 31, 2015 0 [1]
Other, net 0
Balance at March 31, 2016 28 [1]
Anadarko Excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Balance at December 31, 2015 12,957 [2]
Other, net 13 [2]
Balance at March 31, 2016 15,682 [2]
Revolving Credit Facility [Member] | 364-Day Credit Facility due 2017 [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 1,350
Repayments, credit facility (1,350)
Revolving Credit Facility [Member] | 364-Day Credit Facility due 2017 [Member] | Anadarko Excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 1,350 [2]
Repayments, credit facility (1,350) [2]
Revolving Credit Facility [Member] | WES RCF [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 330
Revolving Credit Facility [Member] | WES RCF [Member] | Western Gas Partners, LP [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 330
Revolving Credit Facility [Member] | WGP RCF [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 28
Revolving Credit Facility [Member] | WGP RCF [Member] | Western Gas Equity Partners, LP excluding WES [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 28 [1]
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) [2]
Senior Notes [Member] | 7.50% Tangible Equity Units [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes (8)
Senior Notes [Member] | Anadarko Excluding WES and WGP [Member] | 7.50% Tangible Equity Units [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes (8) [2]
Senior Notes [Member] | 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
Senior Notes [Member] | 4.850% Senior Notes Due 2021 [Member] | Anadarko Excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Issuances $ 794 [2]
Debt instrument, stated interest rate 4.85%
Debt instrument, maturity date Mar. 15, 2021
Senior Notes [Member] | 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
Senior Notes [Member] | 5.550% Senior Notes due 2026 [Member] | Anadarko Excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Issuances $ 1,088 [2]
Debt instrument, stated interest rate 5.55%
Debt instrument, maturity date Mar. 15, 2026
Senior Notes [Member] | 6.600% Senior Notes due 2046  
Debt Instrument [Line Items]  
Issuances $ 1,088
Debt instrument, stated interest rate 6.66%
Debt instrument, maturity date Mar. 15, 2046
Senior Notes [Member] | 6.600% Senior Notes due 2046 | Anadarko Excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Issuances $ 1,088 [2]
Debt instrument, stated interest rate 6.66%
Debt instrument, maturity date Mar. 15, 2046
[1] Excludes WES.
[2] Excludes WES and WGP.