Investment Securities - Components of Non-marketable and Other Equity Securities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Investments in qualified affordable housing projects, net	$ 1,134	$ 954
Non-marketable and other equity securities	2,645	2,543
Fair value accounting | Consolidated venture capital and private equity fund investments
Investment Holdings [Line Items]
Nonmarketable securities	174	130
Fair value accounting | Unconsolidated venture capital and private equity fund investments
Investment Holdings [Line Items]
Nonmarketable securities	172	208
Fair value accounting | Equity securities
Investment Holdings [Line Items]
Other equity securities in public companies (fair value accounting)	32	117
Fair value accounting | Other investments
Investment Holdings [Line Items]
Nonmarketable securities	188	164
Equity method accounting
Investment Holdings [Line Items]
Nonmarketable securities	663	671
Equity method accounting | Consolidated venture capital and private equity fund investments
Investment Holdings [Line Items]
Nonmarketable securities	663	671
Equity method accounting | Debt funds
Investment Holdings [Line Items]
Nonmarketable securities	5	5
Equity method accounting | Other investments
Investment Holdings [Line Items]
Nonmarketable securities	$ 277	$ 294