Business Combinations - Schedule of Business Acquisitions - SVBB Acquisition (Details) - USD ($) $ in Millions			3 Months Ended		6 Months Ended
	Jun. 30, 2023	Mar. 27, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Liabilities
Gain on acquisition			$ 55	$ 0	$ 9,879	$ 431
SVB
Purchase price consideration
Purchase Money Note	$ 35,808	$ 35,808
Value Appreciation Instrument		500
Purchase price consideration		36,308
Assets
Cash and interest-earning deposits at banks		1,379
Interest-earning deposits at banks		33,932
Investment securities		385
Loans and leases		68,460
Affordable housing tax credit investments		1,273
Premises and equipment		310
Other assets		1,286
Total assets acquired		107,255
Liabilities
Deposits		55,899
Borrowings		10
Deferred tax liabilities	3,280	3,277	$ 3,280		$ 3,280
Other liabilities		1,882
Total liabilities assumed		61,068
Fair value of net assets acquired		46,187
Preliminary gain on acquisition, after income taxes	$ 9,880	9,879
Gain on acquisition		13,156
Book value of net assets acquired		52,522
Business combination asset acquired, discount		16,450
Purchase Money Note, fair value discount		264
SVB | Core Deposits
Assets
Core deposit intangibles		$ 230