Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Repayment of claim of right income	$ 0	$ 2	$ 14
Amount of unrecognized deferred tax liability, reinvested earnings of foreign subsidiaries	18
reinvested earnings of foreign subsidiaries	665
Operating Loss Carryforwards [Line Items]
Net operating loss (NOL) carry forwards	358	8
Domestic tax credits	176	0
Deferred tax assets, valuation allowance	70	0
Effect of CIT Merger		6
Unrecognized tax benefits, income tax penalties and interest accrued	3
Unrecognized tax benefits	30		$ 31
Increase in unrecognized tax benefits is reasonably possible	10
Decrease in unrecognized tax benefits is reasonably possible	10
Domestic Tax Authority | Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Net operating loss (NOL) carry forwards	192
Operating loss carryforwards	913
Domestic tax credits	167
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss (NOL) carry forwards	150
Operating loss carryforwards	2,800
Domestic tax credits	9
Deferred tax assets, valuation allowance	67
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss (NOL) carry forwards	16
Operating loss carryforwards	68
Deferred tax assets, valuation allowance	3	$ 0
CIT Group Inc.
Operating Loss Carryforwards [Line Items]
Deferred tax liabilities	300
Effect of CIT Merger	$ 6