Variable Interest Entities - Consolidated FG VIE's By Type of Collateral (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Assets	$ 14,695	$ 14,326
Liabilities	8,078	7,674
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	314	442
Liabilities	355	469
Variable Interest Entity, Primary Beneficiary | Recourse
Variable Interest Entity [Line Items]
Assets	295	340
Liabilities	336	367
Variable Interest Entity, Primary Beneficiary | Recourse | U.S. | First Lien | RMBS
Variable Interest Entity [Line Items]
Assets	228	270
Liabilities	266	297
Variable Interest Entity, Primary Beneficiary | Recourse | U.S. | Second Lien | RMBS
Variable Interest Entity [Line Items]
Assets	56	70
Liabilities	58	70
Variable Interest Entity, Primary Beneficiary | Recourse | U.S. | Second Lien | Other assets
Variable Interest Entity [Line Items]
Assets	11	0
Liabilities	12	0
Variable Interest Entity, Primary Beneficiary | Nonrecourse
Variable Interest Entity [Line Items]
Assets	19	102
Liabilities	$ 19	$ 102