Retirement Plans and Other Employee Benefits - Schedule of Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Change in benefit obligation
Benefit obligation, beginning of year	$ 599	$ 675
Interest cost	31	32	$ 33
Actuarial (gain) loss	18	(38)
Actual benefits paid	(41)	(42)
Premium paid for annuity purchase	0	(28)
Benefit obligation, end of year	607	599	675
Change in plan assets
Fair value of plan assets, beginning of year	578	638
Actual return on plan assets	33	7
Employer contributions	3	3
Actual benefits paid – settlement payments	(40)	(41)
Actual benefits paid – other payments	(1)	(1)
Premium paid for annuity purchase	0	(28)
Fair value of plan assets, end of year	573	578	638
Funded (unfunded) status of the plans	(34)	(21)
Amounts recognized in the Balance Sheets
Other assets	0	1
Other liabilities	(34)	(22)
Net asset (liability) at end of year	(34)	(21)
Other Benefits
Change in benefit obligation
Benefit obligation, beginning of year	30	31
Interest cost	2	2	2
Actuarial (gain) loss	0	(1)
Actual benefits paid	(2)	(2)
Premium paid for annuity purchase	0	0
Benefit obligation, end of year	30	30	31
Change in plan assets
Fair value of plan assets, beginning of year	24	23
Actual return on plan assets	2	2
Employer contributions	0	1
Actual benefits paid – settlement payments	(2)	(2)
Actual benefits paid – other payments	0	0
Premium paid for annuity purchase	0	0
Fair value of plan assets, end of year	24	24	$ 23
Funded (unfunded) status of the plans	(6)	(6)
Amounts recognized in the Balance Sheets
Other assets	23	22
Other liabilities	(29)	(28)
Net asset (liability) at end of year	$ (6)	$ (6)