Employee Benefit Plans - Reconciliation of Changes in Benefit Obligations, Funded Status and Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plans
Benefit Obligations:
Benefit obligation at beginning of year	$ 161	$ 220
Service cost	4	7	$ 9
Interest cost	8	6	5
Benefits paid	(12)	(15)
Actuarial loss (gain)	8	(57)
Benefit obligation at end of year	169	161	220
Fair Value of Plan Assets:
Fair value of plan assets at beginning of year	158	213
Actual return on plan assets	10	(43)
Employer contributions	8	3
Benefits paid	(12)	(15)
Fair value of plan assets at end of year	164	158	213
Net Funded Status	(5)	(3)
Amounts Recognized in Balance Sheet:
Non-current assets	1	3
Current liabilities	0	0
Non-current liabilities	(6)	(6)
Total liabilities	(5)	(3)
Accumulated Other Comprehensive Loss:
Prior service credit	1	1
Actuarial (loss) gain	(7)	(1)
Total	(6)	0
Post-retirement Benefits
Benefit Obligations:
Benefit obligation at beginning of year	73	102
Service cost	0	1	1
Interest cost	4	3	3
Benefits paid	(5)	(4)
Actuarial loss (gain)	(8)	(29)
Benefit obligation at end of year	64	73	102
Fair Value of Plan Assets:
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	5	4
Benefits paid	(5)	(4)
Fair value of plan assets at end of year	0	0	$ 0
Net Funded Status	(64)	(73)
Amounts Recognized in Balance Sheet:
Non-current assets	0	0
Current liabilities	(4)	(4)
Non-current liabilities	(60)	(69)
Total liabilities	(64)	(73)
Accumulated Other Comprehensive Loss:
Prior service credit	14	24
Actuarial (loss) gain	33	27
Total	$ 47	$ 51