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Reinsurance (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Ceded Credit Risk [Line Items] |  |
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 | 25.00% |
Reinsurance recoverables | $ 17,144.0 | $ 17,748.0
Funds withheld reinsurance liabilities | 1,810.0 | 1,740.0
Swiss Re [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance receivable | 1,300.0 | 1,500.0
Trust funded by Swiss Re to support reinsurance receivable | 2,700.0 |
Liabilities for reinsurance related embedded derivatives | 31.0 |
Funds withheld reinsurance liabilities | 164.0 |
Protective [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance recoverables | 11,800.0 | 12,100.0
Trust funded by Swiss Re to support reinsurance receivable | 14,700.0 | 13,700.0
Athene Holding Ltd. [Member] |  |
Ceded Credit Risk [Line Items] |  |
Amount of amortization, after-tax, of deferred gain on business sold | 30.0 | 8.0
Deposit assets | 6,600.0 | $ 7,500.0
Reserves associated with modified coinsurance reinsurance arrangements | 6,900.0 |
Letter of credit | 200.0 |
Athene Holding Ltd. [Member] | Over-Collateralization [Member] |  |
Ceded Credit Risk [Line Items] |  |
Reserves associated with modified coinsurance reinsurance arrangements | 201.0 |
Athene Holding Ltd. [Member] | Trading Securities [Member] |  |
Ceded Credit Risk [Line Items] |  |
Deposit assets | 3,500.0 |
Athene Holding Ltd. [Member] | AFS Securities [Member] |  |
Ceded Credit Risk [Line Items] |  |
Deposit assets | 2,300.0 |
Athene Holding Ltd. [Member] | Equity Securities [Member] |  |
Ceded Credit Risk [Line Items] |  |
Deposit assets | 14.0 |
Athene Holding Ltd. [Member] | Commercial Mortgage Loans [Member] |  |
Ceded Credit Risk [Line Items] |  |
Deposit assets | 698.0 |
Athene Holding Ltd. [Member] | Derivative Instruments [Member] |  |
Ceded Credit Risk [Line Items] |  |
Deposit assets | 130.0 |
Athene Holding Ltd. [Member] | Other Investments [Member] |  |
Ceded Credit Risk [Line Items] |  |
Deposit assets | 94.0 |
Athene Holding Ltd. [Member] | Cash [Member] |  |
Ceded Credit Risk [Line Items] |  |
Deposit assets | 62.0 |
Athene Holding Ltd. [Member] | Investment Income [Member] |  |
Ceded Credit Risk [Line Items] |  |
Deposit assets | $ 57.0 |

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