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Debt (Narrative) (Details) - USD ($) |  |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 14, 2020 | Dec. 04, 2015 | Sep. 30, 2020 | Apr. 10, 2020 | Apr. 02, 2020 | Mar. 23, 2020 | Mar. 22, 2020
MetLife |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 300,000,000 | $ 150,000,000
Prudential |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 425,000,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 1,000,000,000 | $ 850,000,000 |  |  |  |  |
Debt instrument term | 3 years | 5 years |  |  |  |  |
Line of credit facility, increase limit | $ 250,000,000 |  |  |  |  |  |
Line of credit facility, higher borrowing capacity option | 1,250,000,000 |  |  |  |  |  |
Revolving Credit Facility, Individual Borrowings | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument term |  |  | 30 days |  |  |  |
Revolving Credit Facility, Individual Borrowings | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument term |  |  | 180 days |  |  |  |
Senior Notes |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt covenant, maximum consolidated leverage ratio |  |  | 3.5 |  |  |  |
MetLife 2030 Series D Notes | Senior Notes |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 125,000,000 |  | $ 125,000,000 |  |
Stated interest rate |  |  | 2.50% |  | 2.50% |  |
Prudential 2030 Series D Notes | Senior Notes |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 75,000,000 |  | $ 75,000,000 |  |  |  |
Stated interest rate |  |  | 2.50% | 2.50% |  |  |

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