Nature of Operations and Basis of Presentation - Schedule of Components of Other Income, net (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other components of net periodic benefit cost	$ (5)	$ (5)	$ (17)	$ (17)
Net loss (gain) from investments	3	7	(8)	7
Other income, net	$ (2)	$ 2	$ (25)	$ (10)

Amount of realized and unrealized gain (loss) on investment.

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Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

+ References

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Amount of income (expense) related to nonoperating activities, classified as other.

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