Post-Retirement and Similar Obligations - Periodic Benefit Costs Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 4	$ 4
Interest cost	27	30	83	91
Expected return on plan assets	(38)	(36)	(119)	(109)
Amortization of prior service costs	0	0	1	1
Amortization of actuarial loss	8	1	23	2
Settlement Charge	1	0	1	0
Net Periodic Benefit Credit (Cost)	(1)	(4)	(7)	(11)
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	1	1
Interest cost	4	3	10	10
Expected return on plan assets	(1)	(1)	(3)	(4)
Amortization of prior service costs	(1)	0	(1)	0
Amortization of actuarial loss	(1)	(3)	(4)	(9)
Net Periodic Benefit Credit (Cost)	$ 1	$ (1)	$ 3	$ (2)