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Post-retirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Employer contribution to defined benefit plan			$ 18	$ 16
Maximum
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Other postretirement benefit expense	$ 1	$ 1	1	1
Amortization of net actuarial loss	1	$ 1	1	$ 1
Additional contributions	6		6
Minimum
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block
Additional contributions	$ 2		$ 2

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year.

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Amount of cost (reversal of cost) for other postretirement benefits. Excludes pension benefits.

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