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Securitizations and Variable Interest Entities, Resecuritization Activities (Details) - Resecuritization [Member] - VIEs that we do not consolidate [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Variable Interest Entity [Line Items]
Assets, nonconsolidated VIE to which we sold assets and hold an interest	$ 55,500		$ 52,900
Trading debt securities [Member]
Variable Interest Entity [Line Items]
Assets sold	7,800	$ 4,900
Carrying value [Member]
Variable Interest Entity [Line Items]
Trading debt securities	1,300		$ 1,100
Fair value, inputs, level 2 [Member] \| Trading debt securities [Member]
Variable Interest Entity [Line Items]
Securities recognized	$ 628	$ 575