Variable Interest Entities - Nonconsolidated Variable Interest Entities (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Total assets	$ 1,577,153	$ 1,571,386	$ 1,441,799
Total liabilities	1,459,876	$ 1,454,893	1,324,610
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets in VIEs	190,941		181,697
Total assets	14,076		12,325
Total liabilities	924		659
Maximum exposure to loss:	26,274		23,819
Retained interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	5,438		5,043
Purchased interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	905		861
Commitments and guarantees | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	3,994		3,087
Derivatives | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	8,623		8,802
Debt and equity | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	7,314		6,026
Mortgage-backed | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets in VIEs	126,178		127,290
Total assets	5,187		4,977
Maximum exposure to loss:	5,222		5,043
Mortgage-backed | Retained interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	4,930		4,645
Mortgage-backed | Purchased interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	256		332
Mortgage-backed | Commitments and guarantees | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	34		64
Mortgage-backed | Derivatives | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	2		2
Real estate, credit- and power-related and other investing | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets in VIEs	40,553		29,193
Total assets	4,543		4,415
Total liabilities	346		2
Maximum exposure to loss:	7,861		7,093
Real estate, credit- and power-related and other investing | Commitments and guarantees | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	3,320		2,679
Real estate, credit- and power-related and other investing | Debt and equity | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	4,541		4,414
Corporate debt and other asset-backed | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets in VIEs	19,827		19,428
Total assets	4,254		2,817
Total liabilities	578		657
Maximum exposure to loss:	13,097		11,413
Corporate debt and other asset-backed | Retained interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	508		398
Corporate debt and other asset-backed | Purchased interests | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	649		529
Corporate debt and other asset-backed | Commitments and guarantees | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	638		190
Corporate debt and other asset-backed | Derivatives | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	8,621		8,800
Corporate debt and other asset-backed | Debt and equity | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	2,681		1,496
Investments in funds | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets in VIEs	4,383		5,786
Total assets	92		116
Maximum exposure to loss:	94		270
Investments in funds | Commitments and guarantees | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	2		154
Investments in funds | Debt and equity | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum exposure to loss:	$ 92		$ 116