Pledged Assets and Collateral, Pledged Assets (Details) - USD ($) $ in Millions	Mar. 31, 2024		Dec. 31, 2023		Mar. 31, 2023
Security Owned and Pledged as Collateral, [Abstract]
Trading debt securities	$ 109,324		$ 97,302
Available-for-sale debt securities	138,245		130,448
Held-to-maturity debt securities	258,711		262,708
Total loans	922,784		936,682		$ 947,991
Equity securities	59,556		57,336
Assets	1,959,153	[1]	1,932,468	[1]	$ 1,886,400
Asset pledged as collateral [Member]
Security Owned and Pledged as Collateral, [Abstract]
Assets	861,666		832,045
Pledged to counterparties that had the right to sell or repledge [Member]
Security Owned and Pledged as Collateral, [Abstract]
Trading debt securities	72,150		62,537
Available-for-sale debt securities	3,519		5,055
Equity securities	5,150		2,683
All other assets	564		495
Assets	81,383		70,770
Pledged to counterparties that did not have the right to sell or repledge [Member]
Security Owned and Pledged as Collateral, [Abstract]
Trading debt securities	2,527		2,757
Available-for-sale debt securities	75,340		64,511
Held-to-maturity debt securities	239,681		246,218
Total loans	459,893		445,092
Equity securities	1,762		1,502
All other assets	1,080		1,195
Assets	$ 780,283		$ 761,275

[1] Our consolidated assets at March 31, 2024, and December 31, 2023, include the following assets of certain variable interest entities (VIEs) that can only be used to settle the liabilities of those VIEs: Loans, $5.1 billion and $4.9 billion; all other assets, $500 million and $435 million; and Total assets, $5.6 billion and $5.3 billion, respectively.