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Debt and Interest Expense - Debt Activity Table (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 07, 2018
Dec. 31, 2018
May 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Aug. 31, 2018
Mar. 31, 2018
Debt Instrument [Line Items]              
Carrying value, beginning balance       $ 15,458 [1] $ 15,078    
Other, net       56 54    
Carrying value, ending balance   $ 16,169   16,169 15,458 [1]    
Western Gas Partners LP [Member]              
Debt Instrument [Line Items]              
Carrying value, beginning balance       3,465 [1] 3,091    
Other, net       3 4    
Carrying value, ending balance   4,787   4,787 3,465 [1]    
Western Gas Equity Partners, LP excluding WES [Member]              
Debt Instrument [Line Items]              
Carrying value, beginning balance [2]       28 [1],[3] 28    
Other, net [2]       0      
Carrying value, ending balance [1],[2]   28   28 28 [3]    
Anadarko Excluding WES and WGP [Member]              
Debt Instrument [Line Items]              
Carrying value, beginning balance [4]       11,965 [1],[5] 11,959    
Other, net       53 [5] 50 [4]    
Carrying value, ending balance [1],[4],[5]   $ 11,354   11,354 11,965    
WES RCF [Member]              
Debt Instrument [Line Items]              
Borrowings, credit facilities       540 370    
Repayments of credit facilities       (690)      
WES RCF [Member] | Western Gas Partners LP [Member]              
Debt Instrument [Line Items]              
Borrowings, credit facilities       540 370    
Repayments of credit facilities       (690)      
4.850% Senior Notes due 2021 [Member]              
Debt Instrument [Line Items]              
Repayments of debt       $ (123)      
Debt instrument, stated interest rate   4.85%   4.85%      
4.850% Senior Notes due 2021 [Member] | Anadarko Excluding WES and WGP [Member]              
Debt Instrument [Line Items]              
Repayments of debt   $ (123)   $ (123) [5]      
3.450% Senior Notes due 2024 [Member]              
Debt Instrument [Line Items]              
Repayments of debt       $ (375)      
Debt instrument, stated interest rate   3.45%   3.45%      
3.450% Senior Notes due 2024 [Member] | Anadarko Excluding WES and WGP [Member]              
Debt Instrument [Line Items]              
Repayments of debt   $ (377)   $ (375) [5]      
Senior Notes Zero Coupon [Member]              
Debt Instrument [Line Items]              
Repayments of debt       (35)      
Senior Notes Zero Coupon [Member] | Anadarko Excluding WES and WGP [Member]              
Debt Instrument [Line Items]              
Repayments of debt   $ (36)   $ (35) [5]      
5.550% Senior Notes due 2026 [Member]              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate   5.55%   5.55%      
6.600% Senior Notes due 2046 [Member]              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate   6.60%   6.60%      
WES 4.650% Senior Notes due 2026 [Member]              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate   4.65%   4.65%      
WES 5.450% Senior Notes due 2044 [Member]              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate   5.45%   5.45%      
TEUs - senior amortizing notes due 2018 [Member]              
Debt Instrument [Line Items]              
Repayments of debt $ (9)     $ (17) (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       $ (17) [5] (34) [4]    
4.500% Senior Notes due March 2028 [Member]              
Debt Instrument [Line Items]              
Issuance       $ 394      
Debt instrument, stated interest rate   4.50%   4.50%      
4.500% Senior Notes due March 2028 [Member] | Western Gas Partners LP [Member]              
Debt Instrument [Line Items]              
Issuance       $ 394      
Debt instrument, stated interest rate             4.50%
5.300% Senior Notes due March 2048 [Member]              
Debt Instrument [Line Items]              
Issuance       $ 687      
Debt instrument, stated interest rate   5.30%   5.30%      
5.300% Senior Notes due March 2048 [Member] | Western Gas Partners LP [Member]              
Debt Instrument [Line Items]              
Issuance       $ 687      
Debt instrument, stated interest rate             5.30%
7.000% Debentures due 2027 [Member]              
Debt Instrument [Line Items]              
Repayments of debt         (6)    
Debt instrument, stated interest rate   7.00%   7.00%      
7.000% Debentures due 2027 [Member] | Anadarko Excluding WES and WGP [Member]              
Debt Instrument [Line Items]              
Repayments of debt [5]         (6)    
6.625% Debentures due 2028 [Member]              
Debt Instrument [Line Items]              
Repayments of debt         (3)    
Debt instrument, stated interest rate   6.625%   6.625%      
6.625% Debentures due 2028 [Member] | Anadarko Excluding WES and WGP [Member]              
Debt Instrument [Line Items]              
Repayments of debt [4]         (3)    
7.950% Debentures due 2029 [Member]              
Debt Instrument [Line Items]              
Repayments of debt         (1)    
Debt instrument, stated interest rate   7.95%   7.95%      
7.950% Debentures due 2029 [Member] | Anadarko Excluding WES and WGP [Member]              
Debt Instrument [Line Items]              
Repayments of debt [4]         $ (1)    
4.750% Senior Notes due August 2028 [Member]              
Debt Instrument [Line Items]              
Issuance       $ 396      
Debt instrument, stated interest rate   4.75%   4.75%      
4.750% Senior Notes due August 2028 [Member] | Western Gas Partners LP [Member]              
Debt Instrument [Line Items]              
Issuance       $ 396      
Debt instrument, stated interest rate           4.75%  
5.500% Senior Notes due August 2028 [Member]              
Debt Instrument [Line Items]              
Issuance       $ 342      
Debt instrument, stated interest rate   5.50%   5.50%      
5.500% Senior Notes due August 2028 [Member] | Western Gas Partners LP [Member]              
Debt Instrument [Line Items]              
Issuance       $ 342      
Debt instrument, stated interest rate           5.50%  
7.050% Debentures due 2018 [Member]              
Debt Instrument [Line Items]              
Repayments of debt       $ (114)      
Debt instrument, stated interest rate          
Debt instrument, maturity date            
7.050% Debentures due 2018 [Member] | Anadarko Excluding WES and WGP [Member]              
Debt Instrument [Line Items]              
Repayments of debt [5]     $ (114) $ (114)      
Debt instrument, stated interest rate     7.05%        
WES 2.600% Senior Notes due 2018 [Member]              
Debt Instrument [Line Items]              
Repayments of credit facilities       $ (350)      
Debt instrument, stated interest rate          
Debt instrument, maturity date            
WES 2.600% Senior Notes due 2018 [Member] | Western Gas Partners LP [Member]              
Debt Instrument [Line Items]              
Repayments of credit facilities       $ (350)      
Debt instrument, stated interest rate   2.60%   2.60%      
[1] The Company’s outstanding borrowings, except for borrowings under the WGP RCF, are senior unsecured.
[2] Excludes WES.
[3] Excludes WES.
[4] Excludes WES and WGP
[5] Excludes WES and WGP.