Investment Securities - Major Components of Non-marketable and Other Securities (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Investments in qualified affordable housing projects, net	$ 954	$ 616
Total non-marketable and other securities	2,543	1,802
Consolidated venture capital and private equity fund investments | Fair value accounting
Investment Holdings [Line Items]
Nonmarketable securities	130	89
Consolidated venture capital and private equity fund investments | Equity method accounting
Investment Holdings [Line Items]
Nonmarketable securities	671	362
Unconsolidated venture capital and private equity fund investments | Fair value accounting
Investment Holdings [Line Items]
Nonmarketable securities	208	185
Unconsolidated venture capital and private equity fund investments | Equity method accounting
Investment Holdings [Line Items]
Nonmarketable securities	671	362
Other investments | Fair value accounting
Investment Holdings [Line Items]
Nonmarketable securities	164	61
Other investments | Equity method accounting
Investment Holdings [Line Items]
Nonmarketable securities	294	203
Equity securities | Fair value accounting
Investment Holdings [Line Items]
Other equity securities	117	281
Debt funds | Equity method accounting
Investment Holdings [Line Items]
Nonmarketable securities	$ 5	$ 5