v3.26.1
Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2026
Mar. 15, 2026
Dec. 31, 2025
Sep. 15, 2025
Jan. 15, 2025
Debt Instrument [Line Items]          
Long-term debt $ 31,044   $ 31,896    
Long-Term Debt, Current Maturities (375)   (1,099)    
Long-term debt, less current portion 30,669   30,797    
Revolving Credit Facility          
Debt Instrument [Line Items]          
Commercial paper 0   0    
Commercial Paper          
Debt Instrument [Line Items]          
Maximum borrowing capacity 5,000        
Commercial paper 0   0    
Federal Home Loan Bank Advances          
Debt Instrument [Line Items]          
Short-term borrowings from the FHLB 0   150    
Surplus Notes          
Debt Instrument [Line Items]          
Long-term debt 25   25    
Senior Notes | Senior Unsecured Notes          
Debt Instrument [Line Items]          
Long-term debt $ 31,019   $ 31,871    
Senior Unsecured Notes | 1.500% Senior Unsecured Notes Due 2026          
Debt Instrument [Line Items]          
Debt instrument interest rate   1.50%      
Debt instruments, repurchased face amount   $ 750      
Senior Unsecured Notes | 2.375% Senior Unsecured Notes Due 2025          
Debt Instrument [Line Items]          
Debt instrument interest rate         2.375%
Debt instruments, repurchased face amount         $ 1,250
Senior Unsecured Notes | 4.900% Senior Unsecured Notes Due 2026          
Debt Instrument [Line Items]          
Debt instrument interest rate       4.90%  
Debt instruments, repurchased face amount       $ 500  
Senior Unsecured Notes | 5.350% Senior Unsecured Notes Due 2025          
Debt Instrument [Line Items]          
Debt instrument interest rate       5.35%  
Debt instruments, repurchased face amount       $ 400  
Line of Credit | 5-Year Facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Senior revolving credit facility term 5 years        
Maximum borrowing capacity $ 5,000