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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income attributable to common shareholders $ 1,111 $ 1,051 $ 944
Other comprehensive (loss) income, net of tax:      
Change in employee benefit plan funded status, net of tax of $0, $0 and $(2) in 2025, 2024 and 2023, respectively 0 1 (3)
Defined benefit pension plan amortization of actuarial loss, net of tax of $0 in 2025, 2024 and 2023 1 0 4
Unrealized (loss) gain on cash flow hedges, net of tax of $(2), $9 and $0 in 2025, 2024 and 2023, respectively (4) 39 (8)
Unrealized (loss) gain on available-for-sale fixed-income securities, net of tax of $(1), $0, $0 in 2025, 2024 and 2023, respectively (3) (2) 4
Net other comprehensive income (loss) (6) 38 (3)
Comprehensive income attributable to common shareholders $ 1,105 $ 1,089 $ 941