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Compensation Related Costs, Retirement Benefits - Change in Benefit Obligation (Details) - USD ($) $ in Millions		8 Months Ended	12 Months Ended
		Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 160	$ 160
Cash and Cash Equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		80	80
Mutual Fund
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[1]	44	44
Fixed Income Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		36	36
Fair Value, Inputs, Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		116	116
Fair Value, Inputs, Level 1 | Cash and Cash Equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		80	80
Fair Value, Inputs, Level 1 | Mutual Fund
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[1]	0	0
Fair Value, Inputs, Level 1 | Fixed Income Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		36	36
Fair Value, Inputs, Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		44	44
Fair Value, Inputs, Level 2 | Cash and Cash Equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Fair Value, Inputs, Level 2 | Mutual Fund
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[1]	44	44
Fair Value, Inputs, Level 2 | Fixed Income Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Fair Value, Inputs, Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Fair Value, Inputs, Level 3 | Cash and Cash Equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Fair Value, Inputs, Level 3 | Mutual Fund
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[1]	0	0
Fair Value, Inputs, Level 3 | Fixed Income Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation		137	137	$ 0
Defined Benefit Plan, Benefit Obligation, Business Combination		152
Defined Benefit Plan, Plan Assets, Amount		160	160	0
Defined Benefit Plan, Plan Assets, Business Combination		178
Defined Benefit Plan, Funded (Unfunded) Status of Plan		(23)	(23)
Assets for Plan Benefits, Defined Benefit Plan		24	24
Liability, Defined Benefit Plan, Current		(1)	(1)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position		23	23
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax			(9)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax			0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax			(9)
Defined Benefit Plan, Service Cost		1
Defined Benefit Plan, Interest Cost		5
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment		0
Defined Benefit Plan, Expected Return (Loss) on Plan Assets		(8)
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		0
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(36)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		15
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)			12
Defined Benefit Plan, Plan Assets, Contributions by Employer			5
Defined Benefit Plan, Plan Assets, Benefits Paid			(35)
Defined Benefit Plan, Expected Future Benefit Payment, Year One		71	71
Defined Benefit Plan, Expected Future Benefit Payment, Year Two		3	3
Defined Benefit Plan, Expected Future Benefit Payment, Year Three		3	3
Defined Benefit Plan, Expected Future Benefit Payment, Year Four		3	3
Defined Benefit Plan, Expected Future Benefit Payment, Year Five		4	4
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years		$ 19	$ 19
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		5.46%	5.46%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate		2.59%	2.59%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate			5.76%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets			6.75%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate			4.26%
Other Postretirement Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation		$ 1	$ 1	0
Defined Benefit Plan, Benefit Obligation, Business Combination		12
Defined Benefit Plan, Plan Assets, Amount		0	0	0
Defined Benefit Plan, Plan Assets, Business Combination		0
Defined Benefit Plan, Funded (Unfunded) Status of Plan		1	1
Assets for Plan Benefits, Defined Benefit Plan		0	0
Liability, Defined Benefit Plan, Current		(1)	(1)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position		(1)	(1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax			0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax			11
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax			11
Defined Benefit Plan, Service Cost		0
Defined Benefit Plan, Interest Cost		1
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment		(11)
Defined Benefit Plan, Expected Return (Loss) on Plan Assets		0
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		1
Defined Benefit Plan, Benefit Obligation, Benefits Paid		0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		(1)
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)				0
Defined Benefit Plan, Plan Assets, Contributions by Employer				0
Defined Benefit Plan, Plan Assets, Benefits Paid				$ 0
Defined Benefit Plan, Expected Future Benefit Payment, Year One		1	1
Defined Benefit Plan, Expected Future Benefit Payment, Year Two		0	0
Defined Benefit Plan, Expected Future Benefit Payment, Year Three		0	0
Defined Benefit Plan, Expected Future Benefit Payment, Year Four		0	0
Defined Benefit Plan, Expected Future Benefit Payment, Year Five		0	0
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years		$ 0	$ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		5.64%	5.64%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate			5.74%
[1] (1)    Includes long-term and intermediate credit bonds.

X

- Definition

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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

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Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

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

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

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Amount of increase in benefit obligation of defined benefit plan from business combination.

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

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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