Employee Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Target allocation and pension plan asset allocation
Contributions made to defined benefit pension plans	$ 13	$ 1
Estimated fair value of plan assets	171	182	$ 227
Reconciliation of benefit obligation:
Benefit obligation at beginning of year	276	362
Service cost	6	9	10
Interest cost	13	10	9
Actuarial gains	1	(97)
Plan settlements	(46)
Benefits paid	(8)	(8)
Benefit obligation at end of year	242	276	362
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	182	227
Actual return on plan assets	30	(38)
Employer contributions	13	1
Plan settlements	(46)
Benefits paid	(8)	(8)
Fair value of plan assets at end of year	171	182	227
Funded status	(71)	(94)
Components of net periodic benefit cost:
Service cost	6	9	10
Interest cost	13	10	9
Expected return on plan assets	(11)	(14)	(12)
Amortization		6	9
Settlement loss recognized	1		6
Net periodic benefit cost	9	11	22
Amounts not reflected in net periodic benefit cost and included in accumulated other comprehensive loss (AOCL) before taxes
Total accumulated other comprehensive loss	2	21
Assets exceed accumulated benefits
Target allocation and pension plan asset allocation
Estimated fair value of plan assets	122	126
Reconciliation of benefit obligation:
Benefit obligation at beginning of year	129
Service cost	3
Interest cost	7
Actuarial gains	(1)
Plan settlements	(21)
Benefits paid	(4)
Benefit obligation at end of year	113	129
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	126
Actual return on plan assets	21
Plan settlements	(21)
Benefits paid	(4)
Fair value of plan assets at end of year	122	126
Funded status	9
Components of net periodic benefit cost:
Service cost	3
Interest cost	7
Accumulated benefits exceed assets
Target allocation and pension plan asset allocation
Contributions made to defined benefit pension plans	13
Estimated fair value of plan assets	49	56
Reconciliation of benefit obligation:
Benefit obligation at beginning of year	147
Service cost	3
Interest cost	6
Actuarial gains	2
Plan settlements	(25)
Benefits paid	(4)
Benefit obligation at end of year	129	147
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	56
Actual return on plan assets	9
Employer contributions	13
Plan settlements	(25)
Benefits paid	(4)
Fair value of plan assets at end of year	49	56
Funded status	(80)
Components of net periodic benefit cost:
Service cost	3
Interest cost	6
Defined benefit pension plan
Target allocation and pension plan asset allocation
Contributions made to defined benefit pension plans	0	0	$ 0
Estimated fair value of plan assets	$ 171	$ 182
Weighted-average assumptions
Discount rate used to determine obligations (as a percent)	5.26%	5.38%	2.78%
Discount rate used to determine net periodic benefit cost (as a percent)	5.38%	2.78%	2.39%
Expected return on plan assets (as a percent)	6.50%	6.25%	6.25%
Long-term rate of increase in compensation levels (as a percent)	3.80%	4.00%	4.00%
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	$ 182
Employer contributions	0	$ 0	$ 0
Fair value of plan assets at end of year	171	182
Expected future benefit payments
2024	29
2025	10
2026	15
2027	12
2028	15
Next five years after year five	72
Accumulated benefit obligation	216	247
Accumulated benefit obligation for defined benefit pension plans in excess of plan assets	118	130
Defined benefit pension plan | Level 1
Target allocation and pension plan asset allocation
Estimated fair value of plan assets	171	182
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	182
Fair value of plan assets at end of year	$ 171	182
Defined benefit pension plan | Equity Securities
Target allocation and pension plan asset allocation
Target Allocations (as a percent)	80.00%
Defined benefit pension plan | Domestic equity securities
Target allocation and pension plan asset allocation
Estimated fair value of plan assets	$ 81	84
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	84
Fair value of plan assets at end of year	81	84
Defined benefit pension plan | Domestic equity securities | Level 1
Target allocation and pension plan asset allocation
Estimated fair value of plan assets	81	84
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	84
Fair value of plan assets at end of year	81	84
Defined benefit pension plan | Foreign equity securities
Target allocation and pension plan asset allocation
Estimated fair value of plan assets	51	60
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	60
Fair value of plan assets at end of year	51	60
Defined benefit pension plan | Foreign equity securities | Level 1
Target allocation and pension plan asset allocation
Estimated fair value of plan assets	51	60
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	60
Fair value of plan assets at end of year	$ 51	60
Defined benefit pension plan | Fixed income
Target allocation and pension plan asset allocation
Target Allocations (as a percent)	20.00%
Estimated fair value of plan assets	$ 26	26
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	26
Fair value of plan assets at end of year	26	26
Defined benefit pension plan | Fixed income | Level 1
Target allocation and pension plan asset allocation
Estimated fair value of plan assets	26	26
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	26
Fair value of plan assets at end of year	26	26
Defined benefit pension plan | International fixed income mutual funds
Target allocation and pension plan asset allocation
Estimated fair value of plan assets	11	11
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	11
Fair value of plan assets at end of year	11	11
Defined benefit pension plan | International fixed income mutual funds | Level 1
Target allocation and pension plan asset allocation
Estimated fair value of plan assets	11	11
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	11
Fair value of plan assets at end of year	11	11
Defined benefit pension plan | Money market funds
Target allocation and pension plan asset allocation
Estimated fair value of plan assets	2	1
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	1
Fair value of plan assets at end of year	2	1
Defined benefit pension plan | Money market funds | Level 1
Target allocation and pension plan asset allocation
Estimated fair value of plan assets	2	1
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	1
Fair value of plan assets at end of year	2	$ 1
Group annuity contract
Reconciliation of benefit obligation:
Plan settlements	(34)
Expected future benefit payments
Decrease in related assets due to purchase of group annuity buy-out contract	$ 34