Employee Benefit Plans - Funded Status Recognized on Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Pension  Benefits
Defined Benefit Plan Disclosure [Line Items]
Other assets	$ 117	$ 102
Other liabilities	(8)	(8)
Net amount recognized as of December 31,	109	94
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Other assets	0	0
Other liabilities	(5)	(7)
Net amount recognized as of December 31,	$ (5)	$ (7)