Employee Benefit Plans - Funded Status Recognized on Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Pension  Benefits
Defined Benefit Plan Disclosure [Line Items]
Other assets	$ 121	$ 108
Other liabilities	(11)	(12)
Net amount recognized as of December 31,	110	96
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Other assets	0	0
Other liabilities	(10)	(15)
Net amount recognized as of December 31,	$ (10)	$ (15)