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Benefit Plans - Schedule of Rollforward of Level 3 Plan Assets (Details) - Pension benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Change in plan assets    
Fair value of plan assets, beginning of year $ 4,368 $ 4,440
Fair value of plan assets, end of year 4,414 4,368
Significant unobservable inputs (Level 3)    
Change in plan assets    
Fair value of plan assets, beginning of year 81 0
Relating to assets sold during the period 0 0
Relating to assets still held at the reporting date 0 0
Purchases, sales and settlements, net (3) 81
Net transfers in (out) of Level 3 0 0
Fair value of plan assets, end of year 78 81
Significant unobservable inputs (Level 3) | Bank loans    
Change in plan assets    
Fair value of plan assets, beginning of year 81 0
Relating to assets sold during the period 0 0
Relating to assets still held at the reporting date 0 0
Purchases, sales and settlements, net (3) 81
Net transfers in (out) of Level 3 0 0
Fair value of plan assets, end of year $ 78 $ 81