Pension and Other Postretirement Benefits - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Settlements		$ 0	$ 5	$ 58
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		3	3	4
Interest cost		75	80	51
Expected return on plan assets		(70)	(74)	(80)
Recognized net actuarial loss (gain)		32	28	49
Amortization of prior service benefit		0	0	0
Settlements	$ 3	0	5	58
Net periodic benefit cost		40	42	82
Pension benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Settlements				41
Net periodic benefit cost		40	40	79
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		1	1	2
Interest cost		5	7	4
Expected return on plan assets		0	0	0
Recognized net actuarial loss (gain)		(3)	(3)	1
Amortization of prior service benefit		(10)	(9)	(9)
Settlements		0	0	0
Net periodic benefit cost		$ (7)	$ (4)	$ (2)