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Debt - Gain Loss on Early Extinguishment of Debt (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2025
Jun. 30, 2025
Jun. 30, 2025
Jun. 30, 2024
Extinguishment of Debt [Line Items]        
Principal balance outstanding prior to repurchase     $ 519  
Unamortized debt issuance costs and discounts     (4)  
Amount paid to repurchase debt     (421) $ 0
Gain (loss) on early extinguishment of debt, pre-tax   $ 94 $ 94 $ 0
3.05% notes, due 2030 | Senior notes        
Extinguishment of Debt [Line Items]        
Early extinguishment of debt $ 34      
Debt instrument, interest rate, stated percentage 3.05% 3.05% 3.05%  
4.35% notes, due 2048 | Senior notes        
Extinguishment of Debt [Line Items]        
Early extinguishment of debt $ 129      
Debt instrument, interest rate, stated percentage 4.35% 4.35% 4.35%  
4.375% notes, due 2050 | Senior notes        
Extinguishment of Debt [Line Items]        
Early extinguishment of debt $ 136      
Debt instrument, interest rate, stated percentage 4.375% 4.375% 4.375%  
Variable rate, due 2066 | Subordinated Debt        
Extinguishment of Debt [Line Items]        
Early extinguishment of debt $ 97      
Variable rate, due 2067 | Subordinated Debt        
Extinguishment of Debt [Line Items]        
Early extinguishment of debt 97      
Variable rate, due 2066 | Capital Securities        
Extinguishment of Debt [Line Items]        
Early extinguishment of debt 21      
Variable rate, due 2067 | Capital Securities        
Extinguishment of Debt [Line Items]        
Early extinguishment of debt $ 5