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Income Taxes - Reconciliation of income taxes at the statutory rate to the provision for income taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Earnings before income taxes (“EBT”) $ 239 $ 197
Income taxes at statutory rate 50 41
Effect of state and location income taxes, net of federal income tax effect 3 3
Effect of income tax credits (4) 0
Impact of nontaxable or nondeductible items:    
Effect of tax preference investments (1) (1)
Effect of other nondeductible items 1 0
Effect of other income tax reconciliation adjustments (1) 0
Provision for income taxes $ 48 $ 43
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Income taxes at statutory rate as a percentage of EBT 21.00% 21.00%
Effect of state and local income taxes, net of federal income tax effect as a percentage of EBT 1.00% 2.00%
Effect of income tax credits as a percentage of EBT (2.00%) 0.00%
Impact of nontaxable or nondeductible items:    
Effect of tax preference investments as a percentage of EBT 0.00% (1.00%)
Effect of other nondeductible items as a percentage of EBT 0.00% 0.00%
Effect of other income tax reconciliation adjustments as a percentage of EBT 0.00% 0.00%
Provision for income taxes as shown on the Statement of Earnings as a percentage of EBT 20.00% 22.00%