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Variable Interest Entities (Debt Outstanding) (Details 4) - Consolidated investment entities [Member] - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Debt and stated interest rates |  |
Long-term debt | $ 1,628 | $ 1,743
Minimum [Member] |  |
Debt and stated interest rates |  |
Stated interest rate according to terms of CDO structure | 0.00% |
Maximum [Member] |  |
Debt and stated interest rates |  |
Stated interest rate according to terms of CDO structure | 10.60% |
Collateralized Loan Obligations [Member] |  |
Debt and stated interest rates |  |
Long-term debt | $ 1,628 | $ 1,743
Long-term Debt, Weighted Average Interest Rate | 3.50% | 3.70%

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