Investment Securities - Summary of Venture Capital and Private Equity Fund Investments Held by Consolidated Funds and Percentage Ownership (Details) - Venture capital and private equity fund investments measured at net asset value - Fair value accounting - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Nonmarketable securities	$ 147	$ 130
Strategic Investors Fund, LP
Investment Holdings [Line Items]
Nonmarketable securities	$ 2	$ 2
Strategic Investors Fund, LP | Non-marketable securities
Investment Holdings [Line Items]
Ownership interest percentage	12.60%	12.60%
Capital Preferred Return Fund, LP
Investment Holdings [Line Items]
Nonmarketable securities	$ 28	$ 61
Capital Preferred Return Fund, LP | Non-marketable securities
Investment Holdings [Line Items]
Ownership interest percentage	20.00%	20.00%
Growth Partners, LP
Investment Holdings [Line Items]
Nonmarketable securities	$ 24	$ 67
Growth Partners, LP | Non-marketable securities
Investment Holdings [Line Items]
Ownership interest percentage	33.00%	33.00%
Redwood Evergreen Fund, LP
Investment Holdings [Line Items]
Nonmarketable securities	$ 93	$ 0
Redwood Evergreen Fund, LP | Non-marketable securities
Investment Holdings [Line Items]
Ownership interest percentage	100.00%	0.00%