Securitizations and Variable Interest Entities, Unconsolidated VIEs (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Variable Interest Entity [Line Items]
Total loans	$ 1,031,115	$ 986,167	$ 924,418
Guarantees and other commitments	(351)	(263)
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member]
Variable Interest Entity [Line Items]
Assets, nonconsolidated VIE	7,045	8,640
Guarantees and other commitments	0	0
Maximum exposure to loss	5,125	5,294
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Commercial real estate loans [Member]
Variable Interest Entity [Line Items]
Assets, nonconsolidated VIE	4,975	4,998
Guarantees and other commitments	0	0
Maximum exposure to loss	838	841
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Other [Member]
Variable Interest Entity [Line Items]
Assets, nonconsolidated VIE	1,059	1,057
Guarantees and other commitments	0	0
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Nonconforming mortgage loan securitizations [Member]
Variable Interest Entity [Line Items]
Assets, nonconsolidated VIE	1,011	2,585
Guarantees and other commitments	0	0
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Guarantees and other commitments [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	995	998
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Loans [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	4,960	4,984
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| All other assets [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	165	310
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Carrying value [Member]
Variable Interest Entity [Line Items]
Total loans	4,960	4,984
All other assets	165	310
Net assets	5,125	5,294
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Carrying value [Member] \| Commercial real estate loans [Member]
Variable Interest Entity [Line Items]
Total loans	4,960	4,984
All other assets	15	14
Net assets	4,975	4,998
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Carrying value [Member] \| Other [Member]
Variable Interest Entity [Line Items]
Total loans	0	0
All other assets	10	12
Net assets	10	12
VIEs that we do not consolidate [Member] \| Excluding resecuritization [Member] \| Carrying value [Member] \| Nonconforming mortgage loan securitizations [Member]
Variable Interest Entity [Line Items]
Total loans	0	0
All other assets	140	284
Net assets	$ 140	$ 284

Amount of net assets (liabilities).

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Financing receivable amortized cost, and net investment in sales-type and direct financing leases, excluding accrued interest, before allowance for credit loss.

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