Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in obligation, pension benefits	$ 19		$ 19
Pension plan settlements	(3)	$ (3)	(3)	$ (4)
Contributions and payments	7	12	19	25
Pension benefits
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Benefit obligation	3		3
Pension plan settlements	(3)	(3)	(3)	(4)
Pension benefits | US
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pension plan settlements	$ (3)	$ (3)	$ (3)	$ (4)