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LONG-TERM DEBT - NARRATIVE (Details) - USD ($)
shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2022
Aug. 31, 2020
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 30, 2021
Dec. 31, 2019
Principal payments on long-term debt                    
Aggregate future principal payments and carrying value     $ 28,493,000,000       $ 35,235,000,000 $ 28,493,000,000    
Due next year     101,000,000         101,000,000    
Due in two years     465,000,000         465,000,000    
Due in three years     1,700,000,000         1,700,000,000    
Due in four years     2,500,000,000         2,500,000,000    
Due in five years and thereafter     23,700,000,000         23,700,000,000    
Face value     $ 28,493,000,000       $ 35,235,000,000 $ 28,493,000,000   $ 37,401,000,000
Variable-rate debt as a percentage of total debt     0.20%       3.00% 0.20%    
WES                    
Principal payments on long-term debt                    
Common units exchanged to retire note payable (in units)   27.9                
Note payable retired   $ 260,000,000                
Loss on exchange   46,000,000                
Gain on debt extinguished   $ 76,000,000                
Level 1 | Fair Value                    
Principal payments on long-term debt                    
Estimated fair value of debt     $ 31,100,000,000       $ 33,800,000,000 $ 31,100,000,000    
2-year variable rate term loan due 2021                    
Principal payments on long-term debt                    
Repayments of long-term debt             2,500,000,000      
Senior notes                    
Principal payments on long-term debt                    
Face value             7,000,000,000      
Senior notes | Third quarter repayments                    
Principal payments on long-term debt                    
Cash tender       $ 3,000,000,000            
Repayments of near-term maturities of debt       224,000,000            
Repayments of floating interest rate notes       1,100,000,000            
Senior notes | First quarter repayments                    
Principal payments on long-term debt                    
Repayments of near-term maturities of debt           $ 174,000,000        
Senior notes | Second quarter repayments                    
Principal payments on long-term debt                    
Repayments of near-term maturities of debt         $ 0          
Senior notes | 2.600% senior notes due April 2022 | Subsequent event                    
Principal payments on long-term debt                    
Repayments of long-term debt $ 101,000,000                  
Debt instrument interest rate stated percentage 2.60%                  
Face value $ 28,400,000,000                  
Senior notes | Senior Notes Due from 2024 Through 2049 | Fourth quarter issuances (repayments)                    
Principal payments on long-term debt                    
Repayments of long-term debt     1,600,000,000              
Face value of debt tendered and repurchased     1,500,000,000         1,500,000,000    
Senior notes | 2.700% senior notes due 2022                    
Principal payments on long-term debt                    
Repayments of long-term debt             2,700,000,000      
Senior notes | 2.700% senior notes due 2022 | Fourth quarter issuances (repayments)                    
Principal payments on long-term debt                    
Repayments of long-term debt     627,000,000              
Senior notes | 2.700% senior notes due 2022 | Third quarter repayments                    
Principal payments on long-term debt                    
Repayments of long-term debt       $ 278,000,000            
Debt instrument interest rate stated percentage       2.70%            
Senior notes | Senior Notes Due 2021                    
Principal payments on long-term debt                    
Repayments of long-term debt             3,500,000,000      
Senior notes | 2.700% senior notes due 2023                    
Principal payments on long-term debt                    
Repayments of long-term debt             264,000,000      
Senior notes | 2.700% senior notes due 2023 | Third quarter repayments                    
Principal payments on long-term debt                    
Repayments of long-term debt       $ 484,000,000            
Debt instrument interest rate stated percentage       2.70%            
Senior notes | 0.00% senior notes due October 2036                    
Principal payments on long-term debt                    
Repayments of long-term debt             2,000,000      
Senior notes | Zero Coupon senior notes due 2036                    
Principal payments on long-term debt                    
Aggregate future principal payments and carrying value     $ 2,269,000,000       $ 2,269,000,000 $ 2,269,000,000    
Debt instrument interest rate stated percentage     5.24%         5.24%    
Face value     $ 2,300,000,000         $ 2,300,000,000    
Put in whole, amount     1,100,000,000         1,100,000,000    
Line of credit | Revolving credit racility                    
Principal payments on long-term debt                    
Revolving credit facility, maximum borrowing capacity     4,000,000,000         $ 4,000,000,000 $ 5,000,000,000  
Average annual facility fees               0.302%    
Line of credit | Receivables securitization facility                    
Principal payments on long-term debt                    
Available borrowing capacity     $ 400,000,000         $ 400,000,000