Variable Interest Entities and Securitization Activities - Non-Consolidated VIEs (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Variable Interest Entity
VIE Assets	$ 1,173,776	$ 1,188,140
Additional VIE assets owned	13,348	15,392
VIE Liabilities	1,071,114	1,081,542
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE assets (UPB)	118,492	146,071
MABS
Variable Interest Entity
VIE assets (UPB)	118,492	146,071
Maximum exposure to loss	13,651	18,833
MABS | Assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	13,038	18,062
MABS | Debt and equity interests
Variable Interest Entity
Maximum exposure to loss	13,038	18,062
MABS | Debt and equity interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	13,038	18,062
MABS | Derivative and other contracts
Variable Interest Entity
Maximum exposure to loss	0	0
MABS | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	0	0
MABS | Commitments, guarantees and other
Variable Interest Entity
Maximum exposure to loss	613	771
MABS | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Liabilities	0	0
CDO
Variable Interest Entity
VIE assets (UPB)	2,199	667
Maximum exposure to loss	133	129
CDO | Assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	133	129
CDO | Debt and equity interests
Variable Interest Entity
Maximum exposure to loss	133	129
CDO | Debt and equity interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	133	129
CDO | Derivative and other contracts
Variable Interest Entity
Maximum exposure to loss	0	0
CDO | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	0	0
CDO | Commitments, guarantees and other
Variable Interest Entity
Maximum exposure to loss	0	0
CDO | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Liabilities	0	0
MTOB
Variable Interest Entity
VIE assets (UPB)	6,108	6,089
Maximum exposure to loss	4,023	4,100
MTOB | Assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	4	5
MTOB | Debt and equity interests
Variable Interest Entity
Maximum exposure to loss	0	0
MTOB | Debt and equity interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	0	0
MTOB | Derivative and other contracts
Variable Interest Entity
Maximum exposure to loss	4,023	4,100
MTOB | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	4	5
MTOB | Commitments, guarantees and other
Variable Interest Entity
Maximum exposure to loss	0	0
MTOB | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Liabilities	7	0
OSF
Variable Interest Entity
VIE assets (UPB)	2,026	2,086
Maximum exposure to loss	1,480	1,459
OSF | Assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	1,480	1,459
OSF | Debt and equity interests
Variable Interest Entity
Maximum exposure to loss	1,480	1,459
OSF | Debt and equity interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	1,480	1,459
OSF | Derivative and other contracts
Variable Interest Entity
Maximum exposure to loss	0	0
OSF | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	0	0
OSF | Commitments, guarantees and other
Variable Interest Entity
Maximum exposure to loss	0	0
OSF | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Liabilities	0	0
Other
Variable Interest Entity
VIE assets (UPB)	47,989	52,111
Maximum exposure to loss	16,895	16,943
Other | Assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	13,165	12,345
Other | Debt and equity interests
Variable Interest Entity
Maximum exposure to loss	11,298	10,339
Other | Debt and equity interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	11,298	10,339
Other | Derivative and other contracts
Variable Interest Entity
Maximum exposure to loss	4,128	5,599
Other | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	1,867	2,006
Other | Commitments, guarantees and other
Variable Interest Entity
Maximum exposure to loss	1,469	1,005
Other | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Liabilities	$ 419	$ 362