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Reinsurance (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance, ACL | $ 316.0 |  |  |  | $ 190.0 |  |  |  |  |  |  |  | $ 316.0 | $ 190.0 |
Maximum retention per single insured life on fixed and VUL insurance contracts |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.0 |  |
Percent of mortality risk reinsured on newly issued non-term life insurance contracts |  |  |  |  |  |  |  |  |  |  |  |  | 21.00% |  |
Reinsurance recoverables, net of allowance for credit losses | 19,882.0 | $ 20,045.0 | $ 19,909.0 | $ 20,044.0 | 20,295.0 | $ 15,729.0 | $ 15,981.0 | $ 16,289.0 | $ 19,909.0 | $ 15,981.0 | $ 20,045.0 | $ 15,729.0 | $ 19,882.0 | 20,295.0 |
Realized gain (loss) | (407.0) | $ 212.0 | $ 515.0 | $ 25.0 | 514.0 | $ 79.0 | $ 1.0 | $ (180.0) | $ 540.0 | $ (179.0) | $ 752.0 | $ (100.0) | 345.0 | 414.0 | $ (513.0)
Swiss Re [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trust funded to support reinsurance receivable | 710,000.0 |  |  |  | 1,000.0 |  |  |  |  |  |  |  | 710,000.0 | 1,000.0 |
Reinsurance recoverables, net of allowance for credit losses |  |  |  |  | 1,100.0 |  |  |  |  |  |  |  |  | 1,100.0 |
Protective [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance recoverables, net of allowance for credit losses | 10,100.0 |  |  |  | 10,700.0 |  |  |  |  |  |  |  | 10,100.0 | 10,700.0 |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | 11.5 |  |  |  | 14,000.0 |  |  |  |  |  |  |  | 11.5 | 14,000.0 |
Athene Holding Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance ACL and deposit assets | 3,800.0 |  |  |  | 5,000.0 |  |  |  |  |  |  |  | 3,800.0 | 5,000.0 |
Amount of amortization, after-tax, of deferred gain on business sold |  |  |  |  |  |  |  |  |  |  |  |  | 25.0 | 26.0 | $ 29.0
Reserves associated with modified coinsurance reinsurance arrangements | 3,809.0 |  |  |  | 5,404.0 |  |  |  |  |  |  |  | 3,809.0 | 5,404.0 |
Letter of credit | 117.0 |  |  |  |  |  |  |  |  |  |  |  | 117.0 |  |
Athene Holding Ltd. [Member] | Over-Collateralization [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves associated with modified coinsurance reinsurance arrangements | 105.0 |  |  |  |  |  |  |  |  |  |  |  | 105.0 |  |
Resolution Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance receivable | 4.7 |  |  |  |  |  |  |  |  |  |  |  | 4.7 |  |
Resolution Life [Member] | Over-Collateralization [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance Recoverables | $ 4,100.0 |  |  |  | $ 4,100.0 |  |  |  |  |  |  |  | 4,100.0 | $ 4,100.0 |
Realized gain (loss) |  |  |  |  |  |  |  |  |  |  |  |  | $ 635.0 |  |

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