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Variable Interest Entities (FV Options for consolidated CDOs) (Details 3) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |
Estimated fair value of CLO debt |  | $ 1,900 |  | $ 1,900 |  | $ 1,700
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |
Syndicated loans [Abstract] |  |  |  |  |  |
Unpaid principal balance |  | 2,005 |  | 2,005 |  | 1,678
Excess unpaid principal over fair value |  | (118) |  | (118) |  | (81)
Fair value |  | 1,887 |  | 1,887 |  | 1,597
Fair value of loans more than 90 days past due |  | 4 |  | 4 |  | 4
Fair value of loans in nonaccrual status |  | 22 |  | 22 |  | 42
Difference between fair value and unpaid principal of loans more than 90 days past due, loans in nonaccrual status or both |  | 30 |  | 30 |  | 18
Debt [Abstract] |  |  |  |  |  |
Unpaid principal balance |  | 2,089 |  | 2,089 |  | 1,761
Excess unpaid principal over fair value |  | (188) |  | (188) |  | (133)
Carrying value | [1] | $ 1,901 |  | 1,901 |  | $ 1,628
Debt Instrument, Issuer |  | 394 million |  |  |  |
Net investment income [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |
Total net gains (losses) recognized in net investment income related to changes in the fair value of financial assets and liabilities for which the fair value option was elected |  | $ 20 | $ (3) | $ 7 | $ (8) |
[1] | The carrying value of the CLOs’ debt is set equal to the fair value of the CLOs’ assets. The estimated fair value of the CLOs’ debt was $1.9 billion and $1.7 billion as of September 30, 2020 and December 31, 2019, respectively.

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