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Debt - Debt Activity Table (Detail) - USD ($)
$ in Millions
9 Months Ended
Jun. 07, 2018
Sep. 30, 2018
Aug. 31, 2018
Mar. 31, 2018
Changes in Debt Outstanding [Roll Forward]        
Balance at December 31, 2017 [1]   $ 15,458    
Other, net   41    
Balance at September 30, 2018 [1]   16,467    
Western Gas Partners, LP [Member]        
Changes in Debt Outstanding [Roll Forward]        
Balance at December 31, 2017 [1]   3,465    
Other, net   2    
Balance at September 30, 2018 [1]   4,566    
Western Gas Equity Partners, LP excluding WES [Member]        
Changes in Debt Outstanding [Roll Forward]        
Balance at December 31, 2017 [1],[2]   28    
Balance at September 30, 2018 [1],[2]   28    
Anadarko excluding WES and WGP [Member]        
Changes in Debt Outstanding [Roll Forward]        
Balance at December 31, 2017 [1],[3]   11,965    
Other, net [3]   39    
Balance at September 30, 2018 [1],[3]   11,873    
WES RCF [Member]        
Changes in Debt Outstanding [Roll Forward]        
Borrowings, credit facility   320    
Repayments, credit facility   (690)    
WES RCF [Member] | Western Gas Partners, LP [Member]        
Changes in Debt Outstanding [Roll Forward]        
Borrowings, credit facility   320    
Repayments, credit facility   (690)    
WES 4.500% Senior Notes due 2028 [Member]        
Changes in Debt Outstanding [Roll Forward]        
Issuances   394    
WES 4.500% Senior Notes due 2028 [Member] | Western Gas Partners, LP [Member]        
Changes in Debt Outstanding [Roll Forward]        
Issuances   $ 394    
Debt instrument, stated interest rate   4.50%   4.50%
Debt instrument, maturity date   Mar. 01, 2028    
WES 5.300% Senior Notes due 2048 [Member]        
Changes in Debt Outstanding [Roll Forward]        
Issuances   $ 687    
WES 5.300% Senior Notes due 2048 [Member] | Western Gas Partners, LP [Member]        
Changes in Debt Outstanding [Roll Forward]        
Issuances   $ 687    
Debt instrument, stated interest rate   5.30%   5.30%
Debt instrument, maturity date   Mar. 01, 2048    
WES 4.750% Senior Notes due 2028 [Member]        
Changes in Debt Outstanding [Roll Forward]        
Issuances   $ 396    
WES 4.750% Senior Notes due 2028 [Member] | Western Gas Partners, LP [Member]        
Changes in Debt Outstanding [Roll Forward]        
Issuances   $ 396    
Debt instrument, stated interest rate   4.75% 4.75%  
Debt instrument, maturity date   Aug. 01, 2028    
WES 5.500% Senior Notes due 2048 [Member]        
Changes in Debt Outstanding [Roll Forward]        
Issuances   $ 342    
WES 5.500% Senior Notes due 2048 [Member] | Western Gas Partners, LP [Member]        
Changes in Debt Outstanding [Roll Forward]        
Issuances   $ 342    
Debt instrument, stated interest rate   5.50% 5.50%  
Debt instrument, maturity date   Aug. 01, 2048    
Senior Note Component of 7.50% Tangible Equity Units [Member]        
Changes in Debt Outstanding [Roll Forward]        
Repayments, senior notes $ (9) $ (17)    
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]        
Changes in Debt Outstanding [Roll Forward]        
Repayments, senior notes [3]   (17)    
7.050% Debentures due 2018 [Member]        
Changes in Debt Outstanding [Roll Forward]        
Repayments, senior notes   (114)    
7.050% Debentures due 2018 [Member] | Anadarko excluding WES and WGP [Member]        
Changes in Debt Outstanding [Roll Forward]        
Repayments, senior notes [3]   $ (114)    
Debt instrument, stated interest rate   7.05%    
Debt instrument, maturity date   Mar. 01, 2018    
WES 2.600% Senior Notes due 2018 [Member]        
Changes in Debt Outstanding [Roll Forward]        
Repayments, credit facility   $ (350)    
WES 2.600% Senior Notes due 2018 [Member] | Western Gas Partners, LP [Member]        
Changes in Debt Outstanding [Roll Forward]        
Repayments, credit facility   $ (350)    
Debt instrument, stated interest rate   2.60%    
Debt instrument, maturity date   Aug. 01, 2018    
[1] The Company’s outstanding borrowings, except for borrowings under the WGP RCF, are senior unsecured.
[2] Excludes WES.
[3] Excludes WES and WGP.