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Debt and Interest Expense - Outstanding Debt Table (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 17,032 $ 16,706    
Net unamortized discounts, premiums, and debt issuance costs (3) [1] (1,574) (1,628)    
Total borrowings 15,458 [2] 15,078 [2]   $ 15,648
Capital lease obligations 231 245    
Less short-term debt [3] 142 42    
Total long-term debt 15,547 15,281    
Western Gas Partners, LP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount 3,490 3,120    
Net unamortized discounts, premiums, and debt issuance costs (3) [1] (25) (29)    
Total borrowings 3,465 [2] 3,091 [2]   2,691
Capital lease obligations 0 0    
Less short-term debt 0 0    
Total long-term debt 3,465 3,091    
Western Gas Equity Partners, LP excluding WES [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [4] 28 28    
Net unamortized discounts, premiums, and debt issuance costs (3) [1],[4] 0 0    
Total borrowings [4] 28 [2] 28 [2]   0
Capital lease obligations [4] 0 0    
Less short-term debt [4] 0 0    
Total long-term debt [4] 28 28    
Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] 13,514 13,558    
Net unamortized discounts, premiums, and debt issuance costs (3) [1],[5] (1,549) (1,599)    
Total borrowings [5] 11,965 [2] 11,959 [2]   $ 12,957
Capital lease obligations [5] 231 245    
Less short-term debt [5] 142 42    
Total long-term debt [5] 12,054 12,162    
7.050% Debentures due 2018 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 114 114    
Debt instrument, stated interest rate 7.05%      
Debt instrument, maturity date May 15, 2018      
7.050% Debentures due 2018 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 114 114    
TEUs - senior amortizing notes due 2018 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 17 51    
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]        
Debt instrument, principal amount [5] $ 17 51    
WES 2.600% Senior Notes due 2018 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 350 350    
Debt instrument, stated interest rate 2.60%      
Debt instrument, maturity date Aug. 15, 2018      
WES 2.600% Senior Notes due 2018 [Member] | Western Gas Partners, LP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 350 350    
Debt instrument, stated interest rate 2.60%      
6.950% Senior Notes due 2019 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 300 300    
Debt instrument, stated interest rate 6.95%      
Debt instrument, maturity date Jun. 15, 2019      
6.950% Senior Notes due 2019 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 300 300    
8.700% Senior Notes due 2019 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 600 600    
Debt instrument, stated interest rate 8.70%      
Debt instrument, maturity date Mar. 15, 2019      
8.700% Senior Notes due 2019 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 600 600    
4.850% Senior Notes due 2021 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 800 800    
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]        
Debt instrument, principal amount [5] $ 800 800    
WES 5.375% Senior Notes due 2021 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 500 500    
Debt instrument, stated interest rate 5.375%      
Debt instrument, maturity date Jun. 01, 2021      
WES 5.375% Senior Notes due 2021 [Member] | Western Gas Partners, LP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 500 500    
WES 4.000% Senior Notes due 2022 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 670 670    
Debt instrument, stated interest rate 4.00%      
Debt instrument, maturity date Jun. 01, 2022      
WES 4.000% Senior Notes due 2022 [Member] | Western Gas Partners, LP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 670 670    
3.450% Senior Notes due 2024 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 625 625    
Debt instrument, stated interest rate 3.45%      
Debt instrument, maturity date Jul. 15, 2024      
3.450% Senior Notes due 2024 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 625 625    
6.950% Senior Notes due 2024 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 650 650    
Debt instrument, stated interest rate 6.95%      
Debt instrument, maturity date Jun. 01, 2024      
6.950% Senior Notes due 2024 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 650 650    
WES 3.950% Senior Notes due 2025 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 500 500    
Debt instrument, stated interest rate 3.95%      
Debt instrument, maturity date May 15, 2025      
WES 3.950% Senior Notes due 2025 [Member] | Western Gas Partners, LP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 500 500    
WES 4.650% Senior Notes due 2026 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 500 500    
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]        
Debt instrument, principal amount $ 500 500    
Debt instrument, stated interest rate 4.65%      
Debt instrument, maturity date Jul. 12, 2026      
5.550% Senior Notes due 2026 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 1,100 1,100    
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]        
Debt instrument, principal amount [5] $ 1,100 1,100    
7.500% Debentures due 2026 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 112 112    
Debt instrument, stated interest rate 7.50%      
Debt instrument, maturity date Oct. 15, 2026      
7.500% Debentures due 2026 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 112 112    
7.000% Debentures due 2027 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 48 54    
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]        
Debt instrument, principal amount [5] $ 48 54    
7.125% Debentures due 2027 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 150 150    
Debt instrument, stated interest rate 7.125%      
Debt instrument, maturity date Oct. 15, 2027      
7.125% Debentures due 2027 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 150 150    
6.625% Debentures due 2028 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 14 17    
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]        
Debt instrument, principal amount [5] $ 14 17    
7.150% Debentures due 2028 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 235 235    
Debt instrument, stated interest rate 7.15%      
Debt instrument, maturity date May 15, 2028      
7.150% Debentures due 2028 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 235 235    
7.200% Debentures due 2029 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 135 135    
Debt instrument, stated interest rate 7.20%      
Debt instrument, maturity date Mar. 15, 2029      
7.200% Debentures due 2029 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 135 135    
7.950% Debentures due 2029 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 116 117    
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]        
Debt instrument, principal amount [5] $ 116 117    
7.500% Senior Notes due 2031 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 900 900    
Debt instrument, stated interest rate 7.50%      
Debt instrument, maturity date May 01, 2031      
7.500% Senior Notes due 2031 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 900 900    
7.875% Senior Notes due 2031 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 500 500    
Debt instrument, stated interest rate 7.875%      
Debt instrument, maturity date Sep. 15, 2031      
7.875% Senior Notes due 2031 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 500 500    
Zero Coupon Senior Notes due 2036 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 2,360 2,360    
Debt instrument, maturity date Oct. 10, 2036      
Zero Coupon Senior Notes due 2036 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 2,360 2,360    
6.450% Senior Notes due 2036 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 1,750 1,750    
Debt instrument, stated interest rate 6.45%      
Debt instrument, maturity date Sep. 15, 2036      
6.450% Senior Notes due 2036 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 1,750 1,750    
7.950% Senior Notes due 2039 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 325 325    
Debt instrument, stated interest rate 7.95%      
Debt instrument, maturity date Jun. 15, 2039      
7.950% Senior Notes due 2039 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 325 325    
6.200% Senior Notes due 2040 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 750 750    
Debt instrument, stated interest rate 6.20%      
Debt instrument, maturity date Mar. 15, 2040      
6.200% Senior Notes due 2040 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 750 750    
4.500% Senior Notes due 2044 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 625 625    
Debt instrument, stated interest rate 4.50%      
Debt instrument, maturity date Jul. 15, 2044      
4.500% Senior Notes due 2044 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 625 625    
WES 5.450% Senior Notes due 2044 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 600 600    
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]        
Debt instrument, principal amount $ 600 600 $ 200  
Debt instrument, stated interest rate 5.45%      
Debt instrument, maturity date Apr. 01, 2044      
6.600% Senior Notes due 2046 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 1,100 1,100    
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]        
Debt instrument, principal amount [5] $ 1,100 1,100    
7.730% Debentures due 2096 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 61 61    
Debt instrument, stated interest rate 7.73%      
Debt instrument, maturity date Sep. 15, 2096      
7.730% Debentures due 2096 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 61 61    
7.500% Debentures due 2096 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 78 78    
Debt instrument, stated interest rate 7.50%      
Debt instrument, maturity date Nov. 01, 2096      
7.500% Debentures due 2096 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 78 78    
7.250% Debentures due 2096 [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 49 49    
Debt instrument, stated interest rate 7.25%      
Debt instrument, maturity date Nov. 15, 2096      
7.250% Debentures due 2096 [Member] | Anadarko Excluding WES and WGP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [5] $ 49 49    
WGP RCF [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount 28      
WGP RCF [Member] | Western Gas Equity Partners, LP excluding WES [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [4] 28      
WES RCF [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount 370 28    
WES RCF [Member] | Western Gas Partners, LP [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount $ 370      
WES RCF [Member] | Western Gas Equity Partners, LP excluding WES [Member]        
Debt Instrument [Line Items]        
Debt instrument, principal amount [4]   $ 28    
[1] Unamortized discounts, premiums, and debt issuance costs are amortized over the term of the related debt. Debt issuance costs related to RCFs are included in other current assets and other assets on the Company’s Consolidated Balance Sheets.
[2] The Company’s outstanding borrowings, except for borrowings under the WGP RCF, are senior unsecured.
[3] Excludes WES and WGP.
[4] Excludes WES.
[5] Excludes WES and WGP