Variable Interest Entities and Securitization Activities - Non-Consolidated VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Variable Interest Entity
VIE Assets	$ 1,160,029	$ 1,188,140
Additional VIE assets owned	13,500	15,392
VIE Liabilities	1,057,940	1,081,542
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE assets (UPB)	125,670	146,071
MABS
Variable Interest Entity
VIE assets (UPB)	125,670	146,071
Maximum exposure to loss	13,445	18,833
MABS | Assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	12,946	18,062
MABS | Debt and equity interests
Variable Interest Entity
Maximum exposure to loss	12,946	18,062
MABS | Debt and equity interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	12,946	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 | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Liabilities	0	0
MABS | Commitments, guarantees and other
Variable Interest Entity
Maximum exposure to loss	499	771
CDO
Variable Interest Entity
VIE assets (UPB)	170	667
Maximum exposure to loss	100	129
CDO | Assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	100	129
CDO | Debt and equity interests
Variable Interest Entity
Maximum exposure to loss	100	129
CDO | Debt and equity interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	100	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 | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Liabilities	0	0
CDO | Commitments, guarantees and other
Variable Interest Entity
Maximum exposure to loss	0	0
MTOB
Variable Interest Entity
VIE assets (UPB)	5,448	6,089
Maximum exposure to loss	3,712	4,100
MTOB | Assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	5	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	3,712	4,100
MTOB | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	5	5
MTOB | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Liabilities	11	0
MTOB | Commitments, guarantees and other
Variable Interest Entity
Maximum exposure to loss	0	0
OSF
Variable Interest Entity
VIE assets (UPB)	2,302	2,086
Maximum exposure to loss	1,592	1,459
OSF | Assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	1,592	1,459
OSF | Debt and equity interests
Variable Interest Entity
Maximum exposure to loss	1,592	1,459
OSF | Debt and equity interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	1,592	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 | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Liabilities	0	0
OSF | Commitments, guarantees and other
Variable Interest Entity
Maximum exposure to loss	0	0
Other
Variable Interest Entity
VIE assets (UPB)	49,714	52,111
Maximum exposure to loss	16,814	16,943
Other | Assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	13,217	12,345
Other | Debt and equity interests
Variable Interest Entity
Maximum exposure to loss	11,423	10,339
Other | Debt and equity interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	11,423	10,339
Other | Derivative and other contracts
Variable Interest Entity
Maximum exposure to loss	4,637	5,599
Other | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Assets	1,794	2,006
Other | Derivative and other contracts | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
VIE Liabilities	448	362
Other | Commitments, guarantees and other
Variable Interest Entity
Maximum exposure to loss	$ 754	$ 1,005