Related Parties - Summary of Sub-allocation assets (Details) - Apollo - Related Party - Sub-allocated assets [Member] $ in Millions	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Sub-allocation Assets	$ 127,550
Percentage of Sub-allocation Assets	100.00%
Core
Related Party Transaction [Line Items]
Sub-allocation Assets	$ 32,474
Percentage of Sub-allocation Assets	25.50%
Core Plus
Related Party Transaction [Line Items]
Sub-allocation Assets	$ 30,155
Percentage of Sub-allocation Assets	23.60%
Yield
Related Party Transaction [Line Items]
Sub-allocation Assets	$ 48,557
Percentage of Sub-allocation Assets	38.00%
High Alpha
Related Party Transaction [Line Items]
Sub-allocation Assets	$ 5,062
Percentage of Sub-allocation Assets	4.00%
Other
Related Party Transaction [Line Items]
Sub-allocation Assets	$ 11,302
Percentage of Sub-allocation Assets	8.90%