Variable Interest Entities - Consolidated FG VIE's By Type of Collateral (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Assets	$ 14,780	$ 14,326
Liabilities	8,271	7,674
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	318	442
Liabilities	352	469
Variable Interest Entity, Primary Beneficiary [Member] | Recourse [Member]
Variable Interest Entity [Line Items]
Assets	298	340
Liabilities	332	367
Variable Interest Entity, Primary Beneficiary [Member] | Recourse [Member] | United States [Member] | First Lien [Member] | RMBS [Member]
Variable Interest Entity [Line Items]
Assets	228	270
Liabilities	261	297
Variable Interest Entity, Primary Beneficiary [Member] | Recourse [Member] | United States [Member] | Second Lien [Member] | RMBS [Member]
Variable Interest Entity [Line Items]
Assets	59	70
Liabilities	59	70
Variable Interest Entity, Primary Beneficiary [Member] | Recourse [Member] | United States [Member] | Second Lien [Member] | Other Assets [Member]
Variable Interest Entity [Line Items]
Assets	11	0
Liabilities	12	0
Variable Interest Entity, Primary Beneficiary [Member] | Nonrecourse [Member]
Variable Interest Entity [Line Items]
Assets	20	102
Liabilities	$ 20	$ 102