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Debt and Interest Expense - Debt Activity Table (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Carrying value, beginning balance   $ 15,078 [1] $ 15,648
Other, net   54 61
Carrying value, ending balance [1]   15,458 15,078
Western Gas Partners, LP [Member]      
Debt Instrument [Line Items]      
Carrying value, beginning balance   3,091 [1] 2,691
Other, net   4 2
Carrying value, ending balance [1]   3,465 3,091
Western Gas Equity Partners, LP excluding WES [Member]      
Debt Instrument [Line Items]      
Carrying value, beginning balance [2]   28 [1] 0
Other, net [2]   0 0
Carrying value, ending balance [1],[2]   28 28
Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Carrying value, beginning balance [3]   11,959 [1] 12,957
Other, net [3]   50 59
Carrying value, ending balance [1],[3]   11,965 11,959
364-Day Facility [Member]      
Debt Instrument [Line Items]      
Borrowings, credit facilities     1,750
Repayments of credit facilities     (1,750)
364-Day Facility [Member] | Western Gas Partners, LP [Member]      
Debt Instrument [Line Items]      
Repayments of credit facilities     0
364-Day Facility [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Borrowings, credit facilities [3]     1,750
Repayments of credit facilities [3]     (1,750)
WES RCF [Member]      
Debt Instrument [Line Items]      
Borrowings, credit facilities   370 600
Repayments of credit facilities     (900)
WES RCF [Member] | Western Gas Partners, LP [Member]      
Debt Instrument [Line Items]      
Borrowings, credit facilities   $ 370 600
Repayments of credit facilities     (900)
WGP RCF [Member]      
Debt Instrument [Line Items]      
Borrowings, credit facilities     28
WGP RCF [Member] | Western Gas Equity Partners, LP excluding WES [Member]      
Debt Instrument [Line Items]      
Borrowings, credit facilities [2]     28
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 [3]     (250)
4.850% Senior Notes due 2021 [Member]      
Debt Instrument [Line Items]      
Issuance [4]     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]      
Issuance [3],[4]     794
5.550% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Issuance [4]     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]      
Issuance [3],[4]     1,088
6.600% Senior Notes due 2046 [Member]      
Debt Instrument [Line Items]      
Issuance [4]     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]      
Issuance [3],[4]     1,088
WES 4.650% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Issuance     495
Debt instrument, stated interest rate   4.65%  
Debt instrument, maturity date   Jul. 01, 2026  
WES 4.650% Senior Notes due 2026 [Member] | Western Gas Partners, LP [Member]      
Debt Instrument [Line Items]      
Issuance     495
Debt instrument, stated interest rate   4.65%  
Debt instrument, maturity date   Jul. 12, 2026  
WES 5.450% Senior Notes due 2044 [Member]      
Debt Instrument [Line Items]      
Issuance     203
Debt instrument, stated interest rate   5.45%  
Debt instrument, maturity date   Apr. 01, 2044  
WES 5.450% Senior Notes due 2044 [Member] | Western Gas Partners, LP [Member]      
Debt Instrument [Line Items]      
Issuance     203
Debt instrument, stated interest rate   5.45%  
Debt instrument, maturity date   Apr. 01, 2044  
5.950% Senior Notes due 2016 [Member]      
Debt Instrument [Line Items]      
Repayments of debt     $ (1,749)
Debt instrument, stated interest rate 5.95%   5.95%
Debt instrument, maturity date Sep. 15, 2016   Sep. 15, 2016
5.950% Senior Notes due 2016 [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Repayments of debt [3]     $ (1,749)
6.375% Senior Notes due 2017 [Member]      
Debt Instrument [Line Items]      
Repayments of credit facilities     $ (1,994)
Debt instrument, stated interest rate 6.375%   6.375%
Debt instrument, maturity date Sep. 15, 2017   Sep. 15, 2017
6.375% Senior Notes due 2017 [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Repayments of credit facilities [3]     $ (1,994)
TEUs - senior amortizing notes due 2018 [Member]      
Debt Instrument [Line Items]      
Repayments of debt   $ (34) (34)
Debt instrument, stated interest rate   1.50%  
Debt instrument, maturity date   Jun. 07, 2018  
TEUs - senior amortizing notes due 2018 [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Repayments of debt [3]   $ (34) $ (34)
7.000% Debentures due 2027 [Member]      
Debt Instrument [Line Items]      
Repayments of debt   $ (6)  
Debt instrument, stated interest rate   7.00%  
Debt instrument, maturity date   Nov. 15, 2027  
7.000% Debentures due 2027 [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Repayments of debt [3]   $ (6)  
6.625% Debentures due 2028 [Member]      
Debt Instrument [Line Items]      
Repayments of debt   $ (3)  
Debt instrument, stated interest rate   6.625%  
Debt instrument, maturity date   Jan. 15, 2028  
6.625% Debentures due 2028 [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Repayments of debt [3]   $ (3)  
7.950% Debentures due 2029 [Member]      
Debt Instrument [Line Items]      
Repayments of debt   $ (1)  
Debt instrument, stated interest rate   7.95%  
Debt instrument, maturity date   Apr. 15, 2029  
7.950% Debentures due 2029 [Member] | Anadarko Excluding WES and WGP [Member]      
Debt Instrument [Line Items]      
Repayments of debt [3]   $ (1)  
[1] The Company’s outstanding borrowings, except for borrowings under the WGP RCF, are senior unsecured.
[2] Excludes WES.
[3] Excludes WES and WGP
[4] Represent senior notes issued in March 2016.