v3.26.1
Benefit Plans (Components of Net Periodic Cost (Benefit)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items]    
Interest cost on projected benefit obligation $ 8 $ 9
Expected return on plan assets (14) (14)
Amortization of net actuarial loss (gain) 2 2
Total net periodic pension cost (benefit) (4) (3)
Net periodic defined benefits expense (reversal of expense), excluding service cost component $ (4) (3)
Transfer period for benefit plan obligations 18 months  
Insurance claims and policyholder's benefits    
Defined Benefit Plan Disclosure [Line Items]    
Net periodic defined benefits expense (reversal of expense), excluding service cost component $ (1) (1)
Other operating expenses    
Defined Benefit Plan Disclosure [Line Items]    
Net periodic defined benefits expense (reversal of expense), excluding service cost component $ (3) $ (2)