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Debt - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
Feb. 28, 2019
Jan. 31, 2019
Jun. 30, 2019
Jul. 01, 2019
Mar. 31, 2019
Feb. 15, 2019
Feb. 14, 2019
Dec. 31, 2018
Zero-Coupon Senior Notes [Member] | Accreted Value at Next Potential Put Date [Member]                
Debt Instrument [Line Items]                
Debt instrument, accreted value     $ 942,000,000          
Anadarko excluding WES [Member] | 8.700 % Senior Notes due 2019 [Member]                
Debt Instrument [Line Items]                
Outstanding borrowings         $ 600,000,000      
Line of credit, interest rate         8.70%      
Anadarko excluding WES [Member] | 6.950% Senior Notes due 2019 [Member]                
Debt Instrument [Line Items]                
Outstanding borrowings         $ 300,000,000      
Line of credit, interest rate         6.95%      
364-Day Credit Facility Due 2017 [Member]                
Debt Instrument [Line Items]                
Line of credit, outstanding borrowings     0          
364-Day Credit Facility Due 2017 [Member] | Anadarko excluding WES [Member]                
Debt Instrument [Line Items]                
Line of credit, maximum capacity   $ 2,000,000,000.0            
Debt instrument, term   364 days            
APC RCF [Member]                
Debt Instrument [Line Items]                
Line of credit, maximum capacity     3,000,000,000.0          
Line of credit, outstanding borrowings     0          
WES RCF [Member]                
Debt Instrument [Line Items]                
Borrowings, credit facility     700,000,000          
WES RCF [Member] | WES [Member]                
Debt Instrument [Line Items]                
Line of credit, maximum capacity           $ 2,000,000,000.0 $ 1,500,000,000  
Line of credit, outstanding borrowings     $ 920,000,000          
Line of credit, interest rate     3.71%          
Borrowings, credit facility     $ 700,000,000          
Letters of credit, outstanding     5,000,000          
Line of credit, available borrowing capacity     1,100,000,000          
WES Term Loan Facility [Member]                
Debt Instrument [Line Items]                
Borrowings, credit facility     2,000,000,000          
WES Term Loan Facility [Member] | WES [Member]                
Debt Instrument [Line Items]                
Line of credit, maximum capacity     2,000,000,000.0          
Line of credit, outstanding borrowings     $ 2,000,000,000.0          
Line of credit, interest rate     3.78%          
Borrowings, credit facility $ 2,000,000,000.0   $ 2,000,000,000          
WES Term Loan Facility [Member] | WES [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Line of credit, maximum capacity       $ 3,000,000,000.0        
Incremental increase to borrowing capacity       1,000,000,000.0        
Carve out provision       $ 1,000,000,000.0        
WGP RCF [Member]                
Debt Instrument [Line Items]                
Repayments, credit facility     28,000,000          
WGP RCF [Member] | WES [Member]                
Debt Instrument [Line Items]                
Repayments, credit facility     28,000,000          
WGP RCF [Member] | Wgp Excluding Wes [Member]                
Debt Instrument [Line Items]                
Line of credit, maximum capacity     35,000,000          
Repayments, credit facility     28,000,000          
Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member]                
Debt Instrument [Line Items]                
Estimated fair value of total borrowings     $ 20,200,000,000         $ 16,800,000,000