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Debt - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Feb. 28, 2018
Jan. 31, 2018
Sep. 30, 2018
Aug. 31, 2018
Jun. 07, 2018
Mar. 31, 2018
Feb. 01, 2018
Dec. 31, 2017
Debt Instrument [Line Items]                
Total borrowings at face value     $ 18,031,000,000         $ 17,032,000,000
APC RCF [Member]                
Debt Instrument [Line Items]                
Line of credit, maximum capacity   $ 3,000,000,000            
Line of credit, expiration date   Jan. 23, 2022            
Line of credit, outstanding borrowings     $ 0          
364-Day Credit Facility Due 2017 [Member]                
Debt Instrument [Line Items]                
Line of credit, maximum capacity   $ 2,000,000,000            
Line of credit, expiration date   Jan. 12, 2019            
Debt instrument, term     364 days          
Line of credit, outstanding borrowings     $ 0          
WES RCF [Member]                
Debt Instrument [Line Items]                
Borrowings, credit facility     320,000,000          
Repayments, credit facility     (690,000,000)          
Fair Value, Inputs, Level 2 [Member] | Valuation, Market Approach [Member]                
Debt Instrument [Line Items]                
Estimated fair value of total borrowings     17,800,000,000         17,700,000,000
TEUs - senior amortizing notes due 2018 [Member]                
Debt Instrument [Line Items]                
Debt instrument, stated interest rate         1.50%      
8.70% Senior Notes due March 2019                
Debt Instrument [Line Items]                
Outstanding borrowings     $ 600,000,000          
Line of credit, interest rate     8.70%          
6.950% Senior Notes Due June 2019 [Member]                
Debt Instrument [Line Items]                
Outstanding borrowings     $ 300,000,000          
Line of credit, interest rate     6.95%          
Zero-Coupon Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt Instrument, earliest call date     Oct. 10, 2019          
Zero-Coupon Senior Notes [Member] | Accreted Value at Next Potential Put Date [Member]                
Debt Instrument [Line Items]                
Debt instrument, accreted value     $ 980,000,000          
WES 4.750% Senior Notes due 2028 [Member]                
Debt Instrument [Line Items]                
Borrowings during period     396,000,000          
WES 5.500% Senior Notes due 2048 [Member]                
Debt Instrument [Line Items]                
Borrowings during period     342,000,000          
WES 2.600% Senior Notes due 2018 [Member]                
Debt Instrument [Line Items]                
Repayments, credit facility     (350,000,000)          
WES 4.500% Senior Notes due 2028 [Member]                
Debt Instrument [Line Items]                
Borrowings during period     394,000,000          
WES 5.300% Senior Notes due 2048 [Member]                
Debt Instrument [Line Items]                
Borrowings during period     687,000,000          
Western Gas Partners, LP [Member]                
Debt Instrument [Line Items]                
Total borrowings at face value     4,620,000,000         3,490,000,000
Western Gas Partners, LP [Member] | WES RCF [Member]                
Debt Instrument [Line Items]                
Line of credit, maximum capacity $ 1,500,000,000              
Line of credit, expiration date Feb. 26, 2023 Feb. 26, 2020            
Line of credit, outstanding borrowings     0          
Line of credit, expandable maximum capacity $ 2,000,000,000              
Borrowings, credit facility     320,000,000          
Repayments, credit facility     (690,000,000)          
Letters of credit, outstanding     5,000,000          
Line of credit, available borrowing capacity     $ 1,495,000,000          
Western Gas Partners, LP [Member] | WES 4.750% Senior Notes due 2028 [Member]                
Debt Instrument [Line Items]                
Debt instrument, stated interest rate     4.75% 4.75%        
Total borrowings at face value       $ 400,000,000        
Borrowings during period     $ 396,000,000          
Western Gas Partners, LP [Member] | WES 5.500% Senior Notes due 2048 [Member]                
Debt Instrument [Line Items]                
Debt instrument, stated interest rate     5.50% 5.50%        
Total borrowings at face value       $ 350,000,000        
Borrowings during period     $ 342,000,000          
Western Gas Partners, LP [Member] | WES 2.600% Senior Notes due 2018 [Member]                
Debt Instrument [Line Items]                
Debt instrument, stated interest rate     2.60%          
Repayments, credit facility     $ (350,000,000)          
Total borrowings at face value     $ 350,000,000          
Western Gas Partners, LP [Member] | WES 4.500% Senior Notes due 2028 [Member]                
Debt Instrument [Line Items]                
Debt instrument, stated interest rate     4.50%     4.50%    
Total borrowings at face value           $ 400,000,000    
Borrowings during period     $ 394,000,000          
Western Gas Partners, LP [Member] | WES 5.300% Senior Notes due 2048 [Member]                
Debt Instrument [Line Items]                
Debt instrument, stated interest rate     5.30%     5.30%    
Total borrowings at face value           $ 700,000,000    
Borrowings during period     $ 687,000,000          
Western Gas Equity Partners, LP excluding WES [Member]                
Debt Instrument [Line Items]                
Total borrowings at face value [1]     28,000,000         $ 28,000,000
Western Gas Equity Partners, LP excluding WES [Member] | WGP RCF [Member]                
Debt Instrument [Line Items]                
Line of credit, expiration date Mar. 14, 2019              
Line of credit, outstanding borrowings     28,000,000          
Line of credit, available borrowing capacity   $ 250,000,000 $ 7,000,000       $ 35,000,000  
Line of credit, interest rate     4.25%          
[1] Excludes WES.