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Debt - Summary of Debt (Details) - USD ($)
$ in Millions
6 Months Ended
May 13, 2025
Jun. 30, 2025
Jun. 30, 2024
May 31, 2025
Debt, Long-Term And Short-Term [Roll Forward]        
Balance as of beginning-of-year   $ 6,156    
Issuance of long-term debt, net of issuance costs   0 $ 346  
Repayment and early extinguishment of debt   (300) $ (100)  
Unamortized premiums (discounts)   (80)    
Unamortized debt issuance costs   1    
Unamortized adjustments from discontinued hedges   (8)    
Fair value hedge on interest rate swap agreements   17    
Balance as of end-of-period   5,767    
Variable rate, due 2066        
Debt, Long-Term And Short-Term [Roll Forward]        
Early extinguishment of capital securities   (21)    
Variable rate, due 2067        
Debt, Long-Term And Short-Term [Roll Forward]        
Early extinguishment of capital securities   (5)    
Senior notes | Issuance of 2.330% Senior Notes, due 2030        
Debt, Long-Term And Short-Term [Roll Forward]        
Issuance of long-term debt, net of issuance costs $ 500 $ 500    
Debt instrument, interest rate, stated percentage 2.33% 2.33%    
Senior notes | Senior Notes, 3.35%, Due 2025        
Debt, Long-Term And Short-Term [Roll Forward]        
Repayment and early extinguishment of debt   $ (300)    
Debt instrument, interest rate, stated percentage   3.35%    
Senior notes | 3.05% notes, due 2030        
Debt, Long-Term And Short-Term [Roll Forward]        
Repayment and early extinguishment of debt   $ (34)    
Debt instrument, interest rate, stated percentage   3.05%   3.05%
Senior notes | 4.35% notes, due 2048        
Debt, Long-Term And Short-Term [Roll Forward]        
Repayment and early extinguishment of debt   $ (129)    
Debt instrument, interest rate, stated percentage   4.35%   4.35%
Senior notes | 4.375% notes, due 2050        
Debt, Long-Term And Short-Term [Roll Forward]        
Repayment and early extinguishment of debt   $ (136)    
Debt instrument, interest rate, stated percentage   4.375%   4.375%
Subordinated Debt | Variable rate, due 2066        
Debt, Long-Term And Short-Term [Roll Forward]        
Repayment and early extinguishment of debt   $ (97)    
Subordinated Debt | Variable rate, due 2067        
Debt, Long-Term And Short-Term [Roll Forward]        
Repayment and early extinguishment of debt   $ (97)