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Debt (Schedule of Senior Note Borrowings) (Details) - Senior Notes | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Apr. 14, 2020 USD ($) | Apr. 10, 2020 | Apr. 02, 2020 USD ($) | Mar. 14, 2019 USD ($) | Dec. 31, 2015 EUR (€) | Dec. 19, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jul. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
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2023 Series A Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |  |  |  |  |  |  | $ 75,000,000
Coupon Rate | 3.94% | 3.94% |  |  |  |  |  |  |  |  | 3.94%
2025 Series B Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |  |  |  |  |  |  | $ 75,000,000
Coupon Rate | 4.04% | 4.04% |  |  |  |  |  |  |  |  | 4.04%
2026 Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |  |  |  |  | $ 75,000,000 |  |
Coupon Rate | 3.72% | 3.72% |  |  |  |  |  |  | 3.72% |  |
2021 Series A Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount | $ 50,000,000 |  |  |  |  |  |  |  |  | $ 50,000,000 |
Coupon Rate | 3.32% | 3.32% |  |  |  |  |  |  |  | 3.32% |
2024 Series B Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |  |  |  |  |  | $ 75,000,000 |
Coupon Rate | 3.76% | 3.76% |  |  |  |  |  |  |  | 3.76% |
2025 Series C Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount | € |  | € 88,857,000 |  |  |  |  | € 88,900,000 |  |  |  |
Coupon Rate | 1.785% | 1.785% |  |  |  |  | 1.785% |  |  |  |
2022 Series A Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |  |  |  | $ 75,000,000 |  |  |
Coupon Rate | 3.25% | 3.25% |  |  |  |  |  | 3.25% |  |  |
2027 Series B Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount | $ 75,000,000 |  |  |  |  |  |  | $ 75,000,000 |  |  |
Coupon Rate | 3.72% | 3.72% |  |  |  |  |  | 3.72% |  |  |
2029 Series C Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount | $ 100,000,000 |  |  |  |  | $ 100,000,000 |  |  |  |  |
Coupon Rate | 4.19% | 4.19% |  |  |  | 4.19% |  |  |  |  |
MetLife 2030 Series D Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount | $ 125,000,000 |  |  |  | $ 125,000,000 |  |  |  |  |  |
Coupon Rate | 2.50% | 2.50% |  |  | 2.50% |  |  |  |  |  |
Prudential 2030 Series D Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount | $ 75,000,000 |  | $ 75,000,000 |  |  |  |  |  |  |  |
Coupon Rate | 2.50% | 2.50% |  | 2.50% |  |  |  |  |  |  |

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