Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Additional Information [Line Items]
Pre-tax earnings from foreign operations	$ 677	$ 293	$ 215
Other comprehensive income (loss), provision (benefit)	985	(702)	(447)
Other comprehensive income (loss), provision (benefit) including HTM portfolio transfer			727
Increase in valuation allowance	59
Valuation allowance	355	296
Accrued interest and penalties expense (benefit) related to income taxes included in income tax expense	30	16	$ 4
Unremitted earnings	1,800
Amount of unrecognized deferred tax liability, bad debt reserve for tax purposes of qualified lender	69
Bad debt reserve for tax purposes of qualified lender	287
Foreign Tax Credit Carryforward
Additional Information [Line Items]
Increase in valuation allowance	35
Net Operating State Losses And Interest Carryforwards
Additional Information [Line Items]
Increase in valuation allowance	24
Internal Revenue Service (IRS)
Additional Information [Line Items]
Operating loss carryforwards	25	36
Operating loss carryforwards, no expiration	20
State and Local Jurisdiction
Additional Information [Line Items]
Operating loss carryforwards	258	250
Foreign Tax Authority
Additional Information [Line Items]
Operating loss carryforwards	$ 91	$ 56