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Long-Term Debt - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 2 Months Ended 9 Months Ended
Oct. 31, 2020
Aug. 31, 2020
Aug. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Long-term Debt            
Note payable retired       $ 260 $ 0  
Total Fair Value            
Long-term Debt            
Estimated fair value of debt       31,500   $ 38,800
Total Fair Value | Level 2            
Long-term Debt            
Estimated fair value of debt       $ 1,600    
Variable rate bonds due February 2021 | Subsequent Event            
Long-term Debt            
Maturity of notes 2 years          
Debt redeemed $ 377          
2-year variable rate Term Loan due 2021 | Subsequent Event            
Long-term Debt            
Debt redeemed 1,000          
Outstanding term loan $ 446          
Low end of range | Issuance Of July And August 2020 Notes            
Long-term Debt            
Maturity of notes     5 years      
Low end of range | Tender Offers July And August 2020            
Long-term Debt            
Maturity of notes     1 year      
High end of range | Issuance Of July And August 2020 Notes            
Long-term Debt            
Maturity of notes     10 years      
High end of range | Tender Offers July And August 2020            
Long-term Debt            
Maturity of notes     3 years      
WES            
Long-term Debt            
Common units exchanged to retire note payable   27.9        
Note payable retired   $ 260        
Loss on exchange   46        
Gain on debt extinguished   $ 76