Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	38	37	113	109
Expected return on plan assets	(43)	(47)	(129)	(141)
Amortization of actuarial loss (gain)	24	23	73	70
Settlements	0	10	0	10
Net periodic cost	19	23	57	48
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1	1
Interest cost	2	2	6	6
Expected return on plan assets	0	0	0	0
Amortization of actuarial loss (gain)	(4)	(4)	(11)	(11)
Settlements	0	0	0	0
Net periodic cost	$ (1)	$ (1)	$ (4)	$ (4)