Employee Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 4			$ 4	$ 0
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 1	$ 1	3	3
Interest cost		2	2	6	6
Expected return on assets		(2)	(2)	(6)	(6)
Settlement loss				4	0
Prior service credit		0	0	0	0
Recognized actuarial gain		0	0	0	0
Net periodic benefit cost (credit)		1	1	7	3
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		0	0	0	0
Interest cost		0	1	2	3
Expected return on assets		0	0	0	0
Settlement loss				0	0
Prior service credit		(3)	(2)	(7)	(7)
Recognized actuarial gain		0	(1)	(2)	(2)
Net periodic benefit cost (credit)		$ (3)	$ (2)	$ (7)	$ (6)