Retirement Plans and Other Employee Benefits - Schedule of Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Change in benefit obligation
Benefit obligation, beginning of year	$ 845	$ 893
Interest cost	20	17	$ 24
Actuarial (gain)/loss	(163)	(26)
Actual benefits paid	(39)	(39)
Benefit obligation, end of year	663	845	893
Change in plan assets
Fair value of plan assets, beginning of year	849	896
Actual return on plan assets	(172)	(18)
Employer contributions	3	10
Actual benefits paid – settlement payments	(2)	(3)
Actual benefits paid – other payments	(1)	(2)
Premium paid for annuity purchase	(36)	(34)
Fair value of plan assets, end of year	641	849	896
Funded (unfunded) status of the plans	(22)	4
Amounts recognized in the Balance Sheets
Other assets	4	37
Other liabilities	(26)	(33)
Net asset (liability) at end of year	(22)	4
Other Benefits
Change in benefit obligation
Benefit obligation, beginning of year	41	46
Interest cost	1	1	1
Actuarial (gain)/loss	(9)	(5)
Actual benefits paid	(1)	(1)
Benefit obligation, end of year	32	41	46
Change in plan assets
Fair value of plan assets, beginning of year	26	23
Actual return on plan assets	(4)	3
Employer contributions	1	1
Actual benefits paid – settlement payments	(2)	(1)
Actual benefits paid – other payments	0	0
Premium paid for annuity purchase	0	0
Fair value of plan assets, end of year	21	26	$ 23
Funded (unfunded) status of the plans	(11)	(15)
Amounts recognized in the Balance Sheets
Other assets	19	23
Other liabilities	(30)	(38)
Net asset (liability) at end of year	$ (11)	$ (15)