Investment Securities - Consolidated Venture Capital and Private Equity Fund Investments (Details) - Consolidated venture capital and private equity fund investments - Fair value accounting - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Nonmarketable securities	$ 130	$ 89
Strategic Investors Fund, LP
Investment Holdings [Line Items]
Nonmarketable securities	$ 2	$ 5
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	$ 61	$ 50
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	$ 67	$ 34
Growth Partners, LP | Non-marketable securities
Investment Holdings [Line Items]
Ownership interest percentage	33.00%	33.00%