Retirement Plans and Other Employee Benefits - Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial (gain) loss arising during measurement period	$ 32	$ 13	$ (8)
Items amortized during the measurement period:
Actuarial (gain)/loss	(11)	(10)	(13)
Total recognized in other comprehensive income	21	3	(21)
Other Benefits
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial (gain) loss arising during measurement period	(3)	(7)	3
Items amortized during the measurement period:
Actuarial (gain)/loss	0	0	0
Total recognized in other comprehensive income	$ (3)	$ (7)	$ 3