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Investments (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) Item | Dec. 31, 2021 USD ($) Item | Dec. 31, 2020 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |
Reclassification of specific investments from fixed maturity securities, available for sale at fair value to fixed maturity securities, held to maturity at amortized cost net of credit allowances | $ 722.0 |  |
Unrealized loss from transfer | 53.0 |  |
Additional contractual commitments | $ 2,600.0 |  |
Contractual commitments, investment period expiration date | Dec. 31, 2026 |  |
Other invested assets | $ 4,085.0 | 2,920.0 |
Fair Value | $ 22,236.0 | $ 22,308.0 |
Number of securities held as primary beneficiary | Item | 0 | 0 |
Maximum exposure to loss | $ 4,100.0 | $ 2,900.0 |
Commitments to fund investments | 2,100.0 |  |
Securities, carrying value | 1,400.0 |  |
Policy Cash Surrender Value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Other invested assets | 939.0 |  |
Recorded an Allowance for Credit Losses [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Aggregate market value of investments in unrealized loss position |  | 16.0 |
Gross unrealized depreciation |  | (0.4) |
Fixed Maturity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Aggregate market value of investments in unrealized loss position | 19,647.0 | 9,335.0 |
Gross unrealized losses on investments in unrealized loss position | 1,982.0 | 203.0 |
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | 1,217.0 | 128.0 |
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | 764.0 | 75.0 |
Fair Value | $ 22,236.0 | $ 22,308.0 |
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member] | Issuer with the second the largest unrealized loss position [Member] | Issuer [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Percentage threshold of unrealized losses not exceeded by any one single issuer | 0.20% | 0.50% |
Fixed Maturity Securities [Member] | US Government Securities [Member] | Sales Revenue, Net [Member] | Issuer [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Percentage threshold of unrealized losses not exceeded by any one single issuer | 5.20% | 2.70% |
Investment Grade [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation | $ 1,100.0 | $ 116.0 |
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation | $ 732.0 | $ 72.0 |

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