v3.24.2
Debt (Details)
$ in Millions
6 Months Ended
Jun. 30, 2024
USD ($)
May 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Commercial Paper        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 4,000      
Commercial paper     $ 0 $ 0
Surplus Notes        
Debt Instrument [Line Items]        
Long-term debt 25   25  
Federal Home Loan Bank Advances        
Debt Instrument [Line Items]        
Short-term borrowings from the FHLB 225   225  
Senior Notes | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Long-term debt $ 27,436   24,870  
Senior Unsecured Notes | 5.150% 2029 Notes Due        
Debt Instrument [Line Items]        
Aggregate principal amount   $ 600    
Debt instrument interest rate   5.15%    
Senior Unsecured Notes | 5.375% 2034 Notes Due        
Debt Instrument [Line Items]        
Aggregate principal amount   $ 1,000    
Debt instrument interest rate   5.375%    
Senior Unsecured Notes | 5.650% 2054 Notes Due        
Debt Instrument [Line Items]        
Aggregate principal amount   $ 1,000    
Debt instrument interest rate   5.65%    
Line of Credit | 5-Year Facility | Revolving Credit Facility        
Debt Instrument [Line Items]        
Senior revolving credit facility term 5 years      
Maximum borrowing capacity $ 4,000      
Covenant, debt-to-capital ratio (not more than) 0.60      
Debt-to-capital ratio 0.396      
Amounts outstanding $ 0   $ 0