Securitizations and Variable Interest Entities, Resecuritization Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Variable Interest Entity [Line Items]
Trading debt securities	$ 109,324		$ 97,302
Resecuritization [Member] | VIEs that we do not consolidate [Member]
Variable Interest Entity [Line Items]
Assets sold	2,700	$ 3,200
Assets, nonconsolidated VIE	110,400		110,400
Resecuritization [Member] | VIEs that we do not consolidate [Member] | Carrying value [Member]
Variable Interest Entity [Line Items]
Trading debt securities	583		$ 984
Resecuritization [Member] | VIEs that we do not consolidate [Member] | Fair value, inputs, level 2 [Member]
Variable Interest Entity [Line Items]
Securities recognized	$ 229	$ 198