Securitizations and Variable Interest Entities, Resecuritization Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022		Mar. 31, 2021	Dec. 31, 2021
Variable Interest Entity [Line Items]
Assets	$ 1,939,709	[1]	$ 1,957,264	$ 1,948,068	[1]
Resecuritization [Member] | VIEs that we do not consolidate [Member]
Variable Interest Entity [Line Items]
Assets sold	6,400		17,400
Assets, nonconsolidated VIE	115,900			117,700
Resecuritization [Member] | VIEs that we do not consolidate [Member] | Carrying value [Member] | Securities [Member]
Variable Interest Entity [Line Items]
Assets	1,300			$ 817
Resecuritization [Member] | VIEs that we do not consolidate [Member] | Fair value, inputs, level 2 [Member]
Variable Interest Entity [Line Items]
Securities recognized	$ 738		$ 1,000

[1] Our consolidated assets at March 31, 2022 and December 31, 2021, included the following assets of certain variable interest entities (VIEs) that can only be used to settle the liabilities of those VIEs: Debt securities, $71 million and $71 million; Loans, $4.9 billion and $4.5 billion; All other assets, $229 million and $234 million; and Total assets, $5.2 billion and $4.8 billion, respectively.