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Postretirement Benefit Plans (Amounts Recognized in OCI) (Details) - Other Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure
Interest cost	$ 1	$ 1	$ 2
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	2	2	3
Amortization of net actuarial loss	1	2	2
Net periodic benefit cost	$ 0	$ 1	$ 1

X

- Definition

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

+ References

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- Definition

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

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