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Debt and Interest Expense - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2018
Jan. 31, 2018
Jan. 31, 2019
Dec. 31, 2018
May 31, 2018
Feb. 28, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2006
Aug. 31, 2018
Mar. 31, 2018
Debt Instrument [Line Items]                        
Debt instrument, principal amount       $ 17,661,000,000     $ 17,661,000,000 $ 17,032,000,000        
Gain (loss) on extinguishment of debt             2,000,000 (2,000,000) $ (155,000,000)      
FPSO capital lease obligation       248,000,000     248,000,000 231,000,000        
FPSO capital lease accumulated depreciation       72,000,000     $ 72,000,000 41,000,000        
Five-Year Credit Facility [Member]                        
Debt Instrument [Line Items]                        
Line of credit, maximum capacity   $ 3,000,000,000                    
Line of credit, expiration date             Jan. 23, 2023          
Line of credit, outstanding borrowings       $ 0     $ 0          
Five-Year Credit Facility [Member] | Minimum [Member] | Euro Interbank Offered Rate or Alternate Base Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             0.00%          
Five-Year Credit Facility [Member] | Maximum [Member]                        
Debt Instrument [Line Items]                        
Ratio of indebtedness to total capital       0.65     0.65          
Five-Year Credit Facility [Member] | Maximum [Member] | Euro Interbank Offered Rate or Alternate Base Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             1.65%          
364-Day Facility [Member]                        
Debt Instrument [Line Items]                        
Line of credit, outstanding borrowings       $ 0     $ 0          
364-Day Facility [Member] | Maximum [Member]                        
Debt Instrument [Line Items]                        
Ratio of indebtedness to total capital       0.65     0.65          
Commercial Paper [Member]                        
Debt Instrument [Line Items]                        
Line of credit, maximum capacity       $ 3,000,000,000     $ 3,000,000,000          
Commercial paper, outstanding borrowings       0     $ 0          
Commercial Paper [Member] | Maximum [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, term             397 days          
WES RCF [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       220,000,000     $ 220,000,000 370,000,000        
Borrowings, credit facilities             540,000,000 370,000,000        
Repayments of credit facilities             690,000,000          
WGP RCF [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       28,000,000     $ 28,000,000 28,000,000        
WGP RCF [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument [Line Items]                        
Line of credit, variable rate floor             0.00%          
WGP RCF [Member] | London Interbank Offered Rate (LIBOR) [Member] | Alternate Base Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             1.00%          
WGP RCF [Member] | Percentage Above Federal Funds Effective Rate [Member] | Alternate Base Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             0.50%          
WGP RCF [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             2.00%          
WGP RCF [Member] | Minimum [Member] | Base Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             1.00%          
WGP RCF [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             2.75%          
WGP RCF [Member] | Maximum [Member] | Base Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             1.75%          
Fair Value, Inputs, Level 2 [Member] | Valuation, Market Approach [Member]                        
Debt Instrument [Line Items]                        
Estimated fair value of total borrowings       16,800,000,000     $ 16,800,000,000 17,700,000,000        
3.450% Senior Notes due 2024 [Member]                        
Debt Instrument [Line Items]                        
Repayments of debt             375,000,000          
Debt instrument, principal amount       $ 248,000,000     $ 248,000,000 625,000,000        
Debt instrument, stated interest rate       3.45%     3.45%          
4.850% Senior Notes due 2021 [Member]                        
Debt Instrument [Line Items]                        
Repayments of debt             $ 123,000,000          
Debt instrument, principal amount       $ 677,000,000     $ 677,000,000 800,000,000        
Debt instrument, stated interest rate       4.85%     4.85%          
7.050% Debentures due 2018 [Member]                        
Debt Instrument [Line Items]                        
Repayments of debt             $ 114,000,000          
Debt instrument, principal amount               114,000,000        
Debt instrument, stated interest rate                    
Zero Coupon Senior Notes due 2036 [Member]                        
Debt Instrument [Line Items]                        
Repayments of debt             $ 35,000,000          
Debt instrument, principal amount       $ 2,270,000,000     $ 2,270,000,000 2,360,000,000        
Loan proceeds upon issuing debt                   $ 500,000,000    
Yield to maturity       5.24%     5.24%          
Debt instrument, accreted value       $ 905,000,000     $ 905,000,000          
Debt instrument, earliest call date             Oct. 10, 2019          
4.500% Senior Notes due March 2028 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       $ 400,000,000     $ 400,000,000          
Debt instrument, stated interest rate       4.50%     4.50%          
5.300% Senior Notes due March 2048 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       $ 700,000,000     $ 700,000,000          
Debt instrument, stated interest rate       5.30%     5.30%          
4.750% Senior Notes due August 2028 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       $ 400,000,000     $ 400,000,000          
Debt instrument, stated interest rate       4.75%     4.75%          
5.500% Senior Notes due August 2028 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       $ 350,000,000     $ 350,000,000          
Debt instrument, stated interest rate       5.50%     5.50%          
WES 2.600% Senior Notes due 2018 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount               350,000,000        
Debt instrument, stated interest rate                    
Repayments of credit facilities             $ 350,000,000          
FPSO Capital Lease [Member]                        
Debt Instrument [Line Items]                        
Anadarko's nonoperated interest       19.00%     19.00%          
FPSO capital lease obligation       $ 225,000,000     $ 225,000,000          
FPSO capital lease asset       225,000,000     $ 225,000,000          
FPSO capital lease initial term             10 years          
FPSO capital lease additional term             10 years          
Capital lease payments made             $ 46,000,000 44,000,000        
Anadarko Excluding WES and WGP [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount [1]       12,793,000,000     12,793,000,000 13,514,000,000        
FPSO capital lease obligation [1]       248,000,000     $ 248,000,000 231,000,000        
Anadarko Excluding WES and WGP [Member] | 364-Day Facility [Member]                        
Debt Instrument [Line Items]                        
Line of credit, maximum capacity   $ 2,000,000,000                    
Debt instrument, term             364 days          
Anadarko Excluding WES and WGP [Member] | 364-Day Facility [Member] | Minimum [Member] | London Interbank Offered Rate or Alternate Base Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             0.00%          
Anadarko Excluding WES and WGP [Member] | 364-Day Facility [Member] | Maximum [Member] | London Interbank Offered Rate or Alternate Base Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             1.675%          
Anadarko Excluding WES and WGP [Member] | 3.450% Senior Notes due 2024 [Member]                        
Debt Instrument [Line Items]                        
Repayments of debt       377,000,000     $ 375,000,000 [2]          
Debt instrument, principal amount $ 625,000,000     248,000,000 [1]     248,000,000 [1] 625,000,000 [1]        
Anadarko Excluding WES and WGP [Member] | 4.850% Senior Notes due 2021 [Member]                        
Debt Instrument [Line Items]                        
Repayments of debt       123,000,000     123,000,000 [2]          
Debt instrument, principal amount 800,000,000     677,000,000 [1]     677,000,000 [1] 800,000,000 [1]        
Anadarko Excluding WES and WGP [Member] | 3.450% Senior Notes Due 2024 and 4.850% Senior Notes due 2021                        
Debt Instrument [Line Items]                        
Gain (loss) on extinguishment of debt       7,000,000                
Anadarko Excluding WES and WGP [Member] | 7.050% Debentures due 2018 [Member]                        
Debt Instrument [Line Items]                        
Repayments of debt [2]         $ 114,000,000   114,000,000          
Debt instrument, principal amount [1]               114,000,000        
Debt instrument, stated interest rate         7.05%              
Anadarko Excluding WES and WGP [Member] | Zero Coupon Senior Notes due 2036 [Member]                        
Debt Instrument [Line Items]                        
Repayments of debt       36,000,000     35,000,000 [2]          
Debt instrument, principal amount $ 2,400,000,000.0     2,270,000,000 [1]     2,270,000,000 [1] 2,360,000,000 [1]        
Gain (loss) on extinguishment of debt       3,000,000                
Extinguishment of debt       90,000,000                
Western Gas Partners LP [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       4,840,000,000     4,840,000,000 3,490,000,000        
FPSO capital lease obligation       0     0 0        
Western Gas Partners LP [Member] | WES RCF [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       220,000,000     220,000,000 370,000,000        
Line of credit, maximum capacity       $ 2,000,000,000   $ 1,500,000,000 2,000,000,000          
Line of credit, expiration date Feb. 26, 2023 Feb. 26, 2020   Feb. 26, 2024   Feb. 26, 2023            
Line of credit, outstanding borrowings       $ 220,000,000     220,000,000          
Line of credit, expandable maximum capacity           $ 2,000,000,000.0            
Line of credit, increase limit           500,000,000            
Borrowings, credit facilities             540,000,000 370,000,000        
Repayments of credit facilities             $ 690,000,000          
Line of credit, interest rate       3.74%     3.74%          
Outstanding letters of credit       $ 5,000,000     $ 5,000,000          
Line of credit, available borrowing capacity       1,300,000,000     $ 1,300,000,000          
Western Gas Partners LP [Member] | WES RCF [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             0.975%          
Western Gas Partners LP [Member] | WES RCF [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             1.45%          
Western Gas Partners LP [Member] | WES 364-Day Facility                        
Debt Instrument [Line Items]                        
Line of credit, maximum capacity       $ 2,000,000,000.0     $ 2,000,000,000.0          
Debt instrument, term             364 days          
Line of credit, ticking fee       0.175%                
Western Gas Partners LP [Member] | WES 364-Day Facility | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             1.00%          
Western Gas Partners LP [Member] | WES 364-Day Facility | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             1.625%          
Western Gas Partners LP [Member] | 4.500% Senior Notes due March 2028 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount                       $ 400,000,000
Debt instrument, stated interest rate                       4.50%
Western Gas Partners LP [Member] | 5.300% Senior Notes due March 2048 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount                       $ 700,000,000
Debt instrument, stated interest rate                       5.30%
Western Gas Partners LP [Member] | 4.750% Senior Notes due August 2028 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount                     $ 400,000,000  
Debt instrument, stated interest rate                     4.75%  
Western Gas Partners LP [Member] | 5.500% Senior Notes due August 2028 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount                     $ 350,000,000  
Debt instrument, stated interest rate                     5.50%  
Western Gas Partners LP [Member] | WES 2.600% Senior Notes due 2018 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       $ 350,000,000     $ 350,000,000 350,000,000        
Debt instrument, stated interest rate       2.60%     2.60%          
Repayments of credit facilities             $ 350,000,000          
Western Gas Equity Partners, LP excluding WES [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       $ 28,000,000 [3]     28,000,000 [3] 28,000,000 [4]        
FPSO capital lease obligation       0 [3]     0 [3] 0 [4]        
Western Gas Equity Partners, LP excluding WES [Member] | WGP RCF [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount [3]       28,000,000     28,000,000 $ 28,000,000        
Line of credit, maximum capacity   $ 250,000,000       $ 35,000,000            
Line of credit, expiration date           Mar. 14, 2019            
Line of credit, outstanding borrowings       28,000,000     28,000,000          
Line of credit, expandable maximum capacity       $ 500,000,000     $ 500,000,000          
Line of credit, interest rate       4.53%     4.53%          
Line of credit, available borrowing capacity       $ 7,000,000     $ 7,000,000          
Accreted Value At Next Potential Put Date [Member] | Zero Coupon Senior Notes due 2036 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, accreted value       $ 942,000,000     $ 942,000,000          
Variable Rate Component 1 [Member] | Western Gas Partners LP [Member] | WES 364-Day Facility | Federal Funds Effective Rate [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             0.50%          
Variable Rate Component 2 [Member] | Western Gas Partners LP [Member] | WES 364-Day Facility | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             1.00%          
Variable Rate Component 2 [Member] | Western Gas Partners LP [Member] | WES 364-Day Facility | Minimum [Member] | Unsecured Debt Rating [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             0.00%          
Variable Rate Component 2 [Member] | Western Gas Partners LP [Member] | WES 364-Day Facility | Maximum [Member] | Unsecured Debt Rating [Member]                        
Debt Instrument [Line Items]                        
Applicable margin added             0.625%          
Subsequent Event [Member] | Anadarko Excluding WES and WGP [Member] | 364-Day Facility [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, term     364 days                  
Line of credit, expiration date     Jan. 12, 2019                  
[1] Excludes WES and WGP
[2] Excludes WES and WGP.
[3] Excludes WES.
[4] Excludes WES.