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Pensions and Other Postretirement Benefits - Narrative (Details) $ in Millions	3 Months Ended		5 Months Ended	6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	May 31, 2024 employee	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Expected number of positions eliminated | employee			350
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 0	$ 0		$ 0	$ 0
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 20	$ 0		$ 20	$ 0
Percent reduction in future years of service of plan participants (more than)	10.00%
Benefit obligation discount rate	5.74%			5.74%
Reduction to benefit obligation	$ 11

X

- Definition

Defined Benefit Plan, Increase (Decrease) In Future Years Of Service For Plan Participants, Percent

+ References

No definition available.

+ Details

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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- Definition

Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(10)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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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.

+ References

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)(7)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(7)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-6

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- Definition

The expected number of positions to be eliminated as a result of restructuring activities.

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