Business Combinations - Computation of Purchase Price and the Assets Acquired Net of Liabilities Assumed (Details) - USD ($) $ in Millions		3 Months Ended	5 Months Ended	9 Months Ended	17 Months Ended
	May 01, 2023	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2024
Liabilities
Gain on acquisition, after income taxes		$ 100		$ 2,812
First Republic
Purchase price consideration
Amounts paid/due to the FDIC, net of cash acquired					$ 13,555
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					67,865
Assets
Securities					30,285
Loans					153,242
Core deposit and customer relationship intangibles					1,455
Indemnification assets - Shared-loss agreements					675
Accounts receivable and other assets					6,740
Total assets acquired					192,397
Liabilities
Deposits					87,572
FHLB advances					27,919
Lending-related commitments					2,614
Accounts payable and other liabilities					2,792
Deferred tax liabilities					757
Total liabilities assumed					121,654
Fair value of net assets acquired					70,743
Gain on acquisition, after income taxes	$ 2,700		$ 2,800		2,878
Cash acquired from acquisition					680
Consideration transferred for settlement of securities financing transaction					447
Tax-oriented investments					1,200
Right-of-use assets acquired					683
Tax-oriented investment liability					669
Lease liabilities assumed					$ 748
First Republic | Purchase Money Note
Liabilities
Term of FDIC Purchase Money Note	5 years
Face amount of notes	$ 50,000