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DEBT AND FINANCING COSTS - Additional Information (Details)
1 Months Ended 12 Months Ended
Aug. 18, 2020
USD ($)
Jun. 21, 2019
USD ($)
Mar. 31, 2019
USD ($)
Nov. 30, 2018
USD ($)
contract
Aug. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
GBP (£)
Aug. 17, 2020
USD ($)
Mar. 26, 2020
GBP (£)
Dec. 31, 2019
GBP (£)
Jun. 19, 2019
USD ($)
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]                            
Loss (gain) from extinguishment of debt           $ (160,000,000) $ 75,000,000 $ 94,000,000            
Unamortized discount           35,000,000 42,000,000              
Debt issuance costs           57,000,000 53,000,000              
Discount of debt amortization           7,000,000 2,000,000 $ 3,000,000            
Commercial paper                            
Debt Instrument [Line Items]                            
Debt instrument, face amount           $ 3,500,000,000                
Period for borrowing funds           270 days                
Short-term debt outstanding           $ 0 0              
Altus Midstream LP                            
Debt Instrument [Line Items]                            
Debt leverage ratio (less than)           4.00     4.00          
Senior Notes                            
Debt Instrument [Line Items]                            
Debt repurchased principle amount   $ 932,000,000     $ 731,000,000                  
Extinguishment of debt amount   1,000,000,000.0     828,000,000                  
Loss (gain) from extinguishment of debt   75,000,000     94,000,000                  
Unamortized debt issuance costs and discount   $ 7,000,000     5,000,000                  
Apache credit facility                            
Debt Instrument [Line Items]                            
Line of credit outstanding           $ 150,000,000 0              
Apache credit facility | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Line of credit facility, committed amount                           $ 4,000,000,000.0
Debt extension term     1 year                      
Quarterly facility fees at per annum rate           0.25%                
Maximum potential lien on assets located in specified regions           $ 1,700,000,000                
Apache credit facility | Revolving Credit Facility | Maximum                            
Debt Instrument [Line Items]                            
Debt-to-capital ratio               0.60            
Percentage of liens of companies consolidated asset           15.00%     15.00%          
Apache credit facility | Revolving Credit Facility | Base Rate                            
Debt Instrument [Line Items]                            
Margin percentage           0.50%                
Apache credit facility | Revolving Credit Facility | LIBOR                            
Debt Instrument [Line Items]                            
Margin percentage           1.50%                
Unsecured Debt                            
Debt Instrument [Line Items]                            
Debt instrument, face amount                   $ 1,250,000,000     $ 1,000,000,000.0  
Unsecured Debt | 4.375% notes due 2028                            
Debt Instrument [Line Items]                            
Debt offering, aggregate principal amount         $ 1,000,000,000.0                  
Debt interest rate         4.375% 4.375%     4.375%          
Unsecured Debt | 4.250% Notes Due January 15, 2030                            
Debt Instrument [Line Items]                            
Debt interest rate                         4.25%  
Debt instrument, face amount                         $ 600,000,000  
Unsecured Debt | 5.350% Notes Due July 1, 2049                            
Debt Instrument [Line Items]                            
Debt interest rate                         5.35%  
Debt instrument, face amount                         $ 400,000,000  
Unsecured Debt | 4.625% Senior Notes Due In 2025                            
Debt Instrument [Line Items]                            
Debt interest rate                   4.625%        
Debt instrument, face amount                   $ 500,000,000        
Unsecured Debt | 4.875% Senior Notes Due In 2027                            
Debt Instrument [Line Items]                            
Debt interest rate                   4.875%        
Debt instrument, face amount                   $ 750,000,000        
Senior Notes                            
Debt Instrument [Line Items]                            
Debt repurchased principle amount $ 644,000,000         $ 588,000,000                
Loss (gain) from extinguishment of debt 2,000,000         (158,000,000)                
Discount to par of debt repurchase 38,000,000         168,000,000                
Debt instrument, repurchase early tender premium 32,000,000                          
Debt repurchase, accrued and unpaid interest $ 6,000,000                          
Debt instrument repurchase program           $ 428,000,000                
Line of Credit | Altus Midstream LP                            
Debt Instrument [Line Items]                            
Debt covenant leverage ratio           5.00     5.00          
Incentive distribution           $ 30,000,000                
Adjusted pursuant agreement consecutive equals or exceeds           $ 350,000,000                
Line of Credit | Altus Midstream LP | Maximum                            
Debt Instrument [Line Items]                            
Debt covenant leverage ratio           5.50     5.50          
Line of Credit | Altus Midstream LP | Minimum                            
Debt Instrument [Line Items]                            
Debt covenant leverage ratio           4.00     4.00          
Line of Credit | Revolving Credit Facility | Altus Midstream LP                            
Debt Instrument [Line Items]                            
Letters of credit outstanding, amount           $ 0 0              
Debt extension term       1 year                    
Line of credit facility maximum borrowing capacity       $ 800,000,000                    
Line of credit facility, number of extension options | contract       2                    
Line of credit facility, maximum borrowing capacity, if adding new lenders       $ 1,500,000,000                    
Line of Credit | Letter of Credit | Altus Midstream LP                            
Debt Instrument [Line Items]                            
Line of credit facility maximum borrowing capacity       100,000,000                    
Line of Credit | Swingline Loan Subfacility | Altus Midstream LP                            
Debt Instrument [Line Items]                            
Line of credit facility maximum borrowing capacity       $ 100,000,000                    
Line of Credit | Uncommitted Lines of Credit                            
Debt Instrument [Line Items]                            
Line of credit outstanding           0 0              
Line of Credit | Uncommitted Lines of Credit | Letter of Credit                            
Debt Instrument [Line Items]                            
Letters of credit outstanding, amount           17,000,000 3,000,000   £ 34,000,000     £ 22,000,000    
Line of Credit | Apache credit facility | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Line of credit facility maximum borrowing capacity     $ 5,000,000,000.0                      
Line of Credit | Apache credit facility | Letter of Credit                            
Debt Instrument [Line Items]                            
Letters of credit outstanding, amount           40,000,000     £ 633,000,000   £ 633,000,000 £ 0    
Line of credit facility, committed amount           2,080,000,000.00                
Line of credit facility maximum borrowing capacity           3,000,000,000.0                
Line of Credit | Altus credit facility | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Line of credit outstanding           624,000,000 396,000,000              
Line of Credit | Altus credit facility | Revolving Credit Facility | Altus Midstream LP                            
Debt Instrument [Line Items]                            
Line of credit outstanding           $ 624,000,000 $ 396,000,000