Postretirement Benefit Obligations (Tables)

6 Months Ended

Jun. 30, 2024

Postemployment Benefits [Abstract]

Schedule of Net Benefit Costs

The components of net periodic benefit costs for the periods were:

	Successor				Predecessor		Successor				Predecessor
	Three Months Ended June 30, 2024		May 18 through June 30, 2023		April 1 through May 17, 2023		Six Months Ended June 30, 2024		May 18 through June 30, 2023		January 1 through May 17, 2023
Postretirement benefits service cost (a)	$	1	$	—	$	—	$	2	$	—	$	1
Interest cost	17		8		9		33		8		27
Expected return on plan assets	(17)		(8)		(11)		(35)		(8)		(33)
Amortization of:
Net loss	—		—		1		—		—		2
Postretirement benefit (gain) loss, net (b)	—		—		(1)		(2)		—		(4)
Net periodic defined benefit cost (credit)	$	1	$	—	$	(1)	$	—	$	—	$	(3)

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(a)Activity presented as “Operation, maintenance and development” on the Consolidated Statements of Operations.

(b)Activity presented as “Other non-operating income (expense), net” on the Consolidated Statements of Operations.