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Benefit Plans - Schedule of Fair Values of Pension Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Free-standing derivatives, liabilities | Quoted prices in active markets for identical assets (Level 1)      
Components of net periodic cost      
Total plan assets at fair value   $ (3)  
Free-standing derivatives, liabilities | Significant other observable inputs (Level 2)      
Components of net periodic cost      
Total plan assets at fair value   (9)  
Free-standing derivatives, liabilities | Significant unobservable inputs (Level 3)      
Components of net periodic cost      
Total plan assets at fair value   0  
Pension benefits      
Components of net periodic cost      
Total plan assets at fair value $ 2,942 $ 2,915  
Total plan assets at fair value, allocation (as a percent) 100.00% 100.00%  
Investments measured using the net asset value practical expedient $ 1,559 $ 1,570  
Securities lending obligation (124) (158)  
Derivatives counterparty and cash collateral netting (1) (8)  
Other net plan assets 38 49  
Total reported plan assets 4,414 4,368 $ 4,440
Pension benefits | Quoted prices in active markets for identical assets (Level 1)      
Components of net periodic cost      
Total plan assets at fair value $ 1,586 $ 1,582  
Total plan assets at fair value, allocation (as a percent) 53.90% 54.20%  
Pension benefits | Significant other observable inputs (Level 2)      
Components of net periodic cost      
Total plan assets at fair value $ 1,278 $ 1,252  
Total plan assets at fair value, allocation (as a percent) 43.40% 43.00%  
Pension benefits | Significant unobservable inputs (Level 3)      
Components of net periodic cost      
Total plan assets at fair value $ 78 $ 81  
Total plan assets at fair value, allocation (as a percent) 2.70% 2.80%  
Total reported plan assets $ 78 $ 81 0
Pension benefits | Equity securities      
Components of net periodic cost      
Total plan assets at fair value 133 107  
Pension benefits | Equity securities | Quoted prices in active markets for identical assets (Level 1)      
Components of net periodic cost      
Total plan assets at fair value 128 106  
Pension benefits | Equity securities | Significant other observable inputs (Level 2)      
Components of net periodic cost      
Total plan assets at fair value 5 1  
Pension benefits | Equity securities | Significant unobservable inputs (Level 3)      
Components of net periodic cost      
Total plan assets at fair value 0 0  
Pension benefits | Government bonds      
Components of net periodic cost      
Total plan assets at fair value 1,424 1,525  
Pension benefits | Government bonds | Quoted prices in active markets for identical assets (Level 1)      
Components of net periodic cost      
Total plan assets at fair value 1,296 1,401  
Pension benefits | Government bonds | Significant other observable inputs (Level 2)      
Components of net periodic cost      
Total plan assets at fair value 128 124  
Pension benefits | Government bonds | Significant unobservable inputs (Level 3)      
Components of net periodic cost      
Total plan assets at fair value 0 0  
Pension benefits | Corporate bonds      
Components of net periodic cost      
Total plan assets at fair value 1,079 985  
Pension benefits | Corporate bonds | Quoted prices in active markets for identical assets (Level 1)      
Components of net periodic cost      
Total plan assets at fair value 0 0  
Pension benefits | Corporate bonds | Significant other observable inputs (Level 2)      
Components of net periodic cost      
Total plan assets at fair value 1,079 985  
Pension benefits | Corporate bonds | Significant unobservable inputs (Level 3)      
Components of net periodic cost      
Total plan assets at fair value 0 0  
Pension benefits | Short-term investments      
Components of net periodic cost      
Total plan assets at fair value 235 220  
Pension benefits | Short-term investments | Quoted prices in active markets for identical assets (Level 1)      
Components of net periodic cost      
Total plan assets at fair value 166 78  
Pension benefits | Short-term investments | Significant other observable inputs (Level 2)      
Components of net periodic cost      
Total plan assets at fair value 69 142  
Pension benefits | Short-term investments | Significant unobservable inputs (Level 3)      
Components of net periodic cost      
Total plan assets at fair value 0 0  
Pension benefits | Free-standing derivatives, assets      
Components of net periodic cost      
Total plan assets at fair value 3 9  
Pension benefits | Free-standing derivatives, assets | Quoted prices in active markets for identical assets (Level 1)      
Components of net periodic cost      
Total plan assets at fair value 0 0  
Pension benefits | Free-standing derivatives, assets | Significant other observable inputs (Level 2)      
Components of net periodic cost      
Total plan assets at fair value 3 9  
Pension benefits | Free-standing derivatives, assets | Significant unobservable inputs (Level 3)      
Components of net periodic cost      
Total plan assets at fair value 0 0  
Pension benefits | Free-standing derivatives, liabilities      
Components of net periodic cost      
Total plan assets at fair value (10) (12)  
Pension benefits | Free-standing derivatives, liabilities | Quoted prices in active markets for identical assets (Level 1)      
Components of net periodic cost      
Total plan assets at fair value (4)    
Pension benefits | Free-standing derivatives, liabilities | Significant other observable inputs (Level 2)      
Components of net periodic cost      
Total plan assets at fair value (6)    
Pension benefits | Free-standing derivatives, liabilities | Significant unobservable inputs (Level 3)      
Components of net periodic cost      
Total plan assets at fair value 0    
Pension benefits | Bank loans      
Components of net periodic cost      
Total plan assets at fair value 78 81  
Pension benefits | Bank loans | Quoted prices in active markets for identical assets (Level 1)      
Components of net periodic cost      
Total plan assets at fair value 0 0  
Pension benefits | Bank loans | Significant other observable inputs (Level 2)      
Components of net periodic cost      
Total plan assets at fair value 0 0  
Pension benefits | Bank loans | Significant unobservable inputs (Level 3)      
Components of net periodic cost      
Total plan assets at fair value 78 81  
Total reported plan assets $ 78 $ 81 $ 0