Business Combinations - Computation of Purchase Price and the Assets Acquired Net of Liabilities Assumed (Details) - USD ($) $ in Millions		3 Months Ended	8 Months Ended	12 Months Ended
	May 01, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Liabilities
Estimated gain on acquisition, after-tax				$ 2,775	$ 0	$ 0
First Republic
Purchase price consideration
Amounts paid/due to the FDIC, net of cash acquired			$ 13,524
Purchase Money Note (at fair value)			48,848
Settlement of First Republic deposit and other related party transactions			5,447
Contingent consideration - Shared-loss agreements			15
Purchase price consideration			67,834
Assets
Securities		$ 30,285	30,285	30,285
Loans		153,242	153,242	153,242
Core deposit and customer relationship intangibles		1,455	1,455	1,455
Indemnification assets - Shared-loss agreements		675	675	675
Accounts receivable and other assets		6,574	6,574	6,574
Total assets acquired		192,231	192,231	192,231
Liabilities
Deposits		87,572	87,572	87,572
FHLB advances		27,919	27,919	27,919
Lending-related commitments		2,614	2,614	2,614
Accounts payable and other liabilities		2,793	2,793	2,793
Deferred tax liabilities		724	724	724
Total liabilities assumed		121,622	121,622	121,622
Fair value of net assets acquired		70,609	70,609	70,609
Estimated gain on acquisition, after-tax	$ 2,700		2,775	2,800
Cash paid at acquisition			10,600
Amounts payable			3,600
Cash acquired from acquisition			680
Consideration transferred for settlement of securities financing transaction			447
Reclassification resulting in an increase to loans		762
Reclassification resulting in a decrease to accounts receivable and other assets		870
Reclassification resulting in an increase to accounts payable and other liabilities		30
Tax-oriented investments acquired		1,200	1,200	1,200
Right-of-use assets acquired		683	683	683
Tax-oriented investment liability assumed		669	669	669
Lease liabilities assumed		$ 748	$ 748	$ 748