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Fair Value Measurements - Schedule of Long Term Debt Redemption and Issuance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 25, 2022
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Apr. 30, 2022
Mar. 31, 2022
Feb. 28, 2022
Jan. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]                    
Debt redemptions     $ 2,903 $ 58            
Losses on deferred cash flows $ 7                  
Losses on deferred cash flows, net 5                  
Debt issuance costs 10 $ 2 2              
Debt issuance costs, after tax 8 $ 1 $ 1              
Promissory Notes | 4.25% Series B Senior Notes Due 2023                    
Debt Instrument [Line Items]                    
Issuance interest rate                 4.25%  
Face amount of debt                 $ 850  
Promissory Notes | 2.85%, 500 Million Notes                    
Debt Instrument [Line Items]                    
Issuance interest rate         2.85%          
Face amount of debt         $ 500          
Promissory Notes | 7.375%, 715 Million Notes due 2031                    
Debt Instrument [Line Items]                    
Issuance interest rate   7.375% 7.375%   7.375%          
Face amount of debt   $ 27 $ 27   $ 715          
Promissory Notes | 4.85% Senior Notes Due 2047                    
Debt Instrument [Line Items]                    
Issuance interest rate   4.85% 4.85%   4.85%          
Face amount of debt   $ 110 $ 110   $ 284          
Senior Notes                    
Debt Instrument [Line Items]                    
Make-whole premium 101                 $ 38
Make-whole premium, net 80                 $ 30
Early repayment of debt 1,100                  
Open market discount   3 3              
Open market discount, net   2 $ 2              
Senior Notes | 7.375%, 715 Million Notes due 2031                    
Debt Instrument [Line Items]                    
Long-term debt and other long-term obligations 1,500                  
Senior Notes | 4.85% Senior Notes Due 2047                    
Debt Instrument [Line Items]                    
Long-term debt and other long-term obligations $ 1,000                  
Senior Notes | 7.375% Notes Due 2031 and 5.35% Notes Due 2047                    
Debt Instrument [Line Items]                    
Debt redemptions   $ 134                
TE | Promissory Notes | 2.65%, Senior Secured Notes Maturing 2028                    
Debt Instrument [Line Items]                    
Issuance interest rate               2.65%    
Face amount of debt               $ 25    
CEI | Promissory Notes | 2.77% Series A Senior Notes Due 2034                    
Debt Instrument [Line Items]                    
Issuance interest rate             2.77%      
Face amount of debt             $ 150      
WP | Promissory Notes | 3.34% FMB's Due April 2022                    
Debt Instrument [Line Items]                    
Issuance interest rate           3.34%        
Face amount of debt           $ 100        
Penn | Promissory Notes | 6.09% First Mortgage Bond Due June 2022                    
Debt Instrument [Line Items]                    
Issuance interest rate         6.09%          
Face amount of debt         $ 100          
Penn | First Mortgage Bond | 3.79%, 150 Million Notes Maturing 2032                    
Debt Instrument [Line Items]                    
Issuance interest rate   3.79% 3.79%              
Face amount of debt   $ 150 $ 150              
OE | Senior Notes | 5.50%, 300 Million Notes Maturing 2033                    
Debt Instrument [Line Items]                    
Issuance interest rate   5.50% 5.50%              
Face amount of debt   $ 300 $ 300