Employee Benefit Plans - Pension Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,553	$ 3,457
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	2,583
Fair value of plan assets at end of year	2,553
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	6
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	745
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	1,858
Fair value of plan assets at end of year	745
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,464
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at end of year	1,464
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	342
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	702
Fair value of plan assets at end of year	342
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	6
Fair value of plan assets at end of year	0
Cash | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	6
Cash | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0
Cash | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at end of year	0
Collective trust funds(a)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	745
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	1,858
Fair value of plan assets at end of year	745
Collective trust funds(a) | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	0
Collective trust funds(a) | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	745
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	1,858
Fair value of plan assets at end of year	745
Collective trust funds(a) | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at end of year	0
Group annuity contract(b)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,464
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	1,464
Group annuity contract(b) | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	0
Group annuity contract(b) | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0
Group annuity contract(b) | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,464
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	0
Purchases	1,430
Unrealized gain	34
Fair value of plan assets at end of year	1,464
Includes accrued liabilities and excludes accrued investment income and other receivables and investments measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,209
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	1,864
Fair value of plan assets at end of year	2,209
Accrued investment income and other receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	42
Fair value of plan assets at end of year	4
Accured liabilities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(2)
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	(25)
Fair value of plan assets at end of year	$ (2)