Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension benefits paid
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 4	$ 12
Interest cost	51	47	97
Expected return on plan assets	(80)	(90)	(136)
Recognized net actuarial loss	49	56	78
Amortization of prior service cost (benefit)	0	1	0
Settlements	58	69	76
Curtailments	0	6	0
Net periodic benefit cost	82	93	127
Discontinued operations	0	0	20
Net amount recognized in Statement of Consolidated Operations	82	93	107
Pension benefits paid | United States
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	79	61	58
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	3
Interest cost	4	5	10
Expected return on plan assets	0	0	0
Recognized net actuarial loss	1	0	3
Amortization of prior service cost (benefit)	(9)	(9)	(6)
Settlements	0	0	0
Curtailments	0	0	(2)
Net periodic benefit cost	(2)	(2)	8
Discontinued operations	0	0	6
Net amount recognized in Statement of Consolidated Operations	$ (2)	(2)	2
Decrease in net periodic benefit cost for the recognition of the federal subsidy awarded under Medicare Part D (less than $1)		1	1
Other postretirement benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Curtailments		$ (23)	$ (66)