Variable Interest Entities - Consolidated FG VIE's By Type of Collateral (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Assets	$ 13,745	$ 14,326
Liabilities	7,472	7,674
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	368	442
Liabilities	394	469
Variable Interest Entity, Primary Beneficiary [Member] | Recourse [Member]
Variable Interest Entity [Line Items]
Assets	286	340
Liabilities	312	367
Variable Interest Entity, Primary Beneficiary [Member] | Recourse [Member] | United States [Member] | First Lien [Member] | RMBS [Member]
Variable Interest Entity [Line Items]
Assets	224	270
Liabilities	252	297
Variable Interest Entity, Primary Beneficiary [Member] | Recourse [Member] | United States [Member] | Second Lien [Member] | RMBS [Member]
Variable Interest Entity [Line Items]
Assets	62	70
Liabilities	60	70
Variable Interest Entity, Primary Beneficiary [Member] | Nonrecourse [Member]
Variable Interest Entity [Line Items]
Assets	82	102
Liabilities	$ 82	$ 102