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Separate Account Balances - Retirement and Income Solutions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Changes in separate account liabilities |  |
Balance at beginning of period | $ 155,375.1 |
Balance at end of period | 167,605.6 | $ 155,375.1
Retirement and Income Solutions |  |
Changes in separate account liabilities |  |
Balance at beginning of period | 115,899.1 |
Balance at end of period | 126,650.4 | 115,899.1
Retirement and Income Solutions | Group retirement contracts |  |
Changes in separate account liabilities |  |
Balance at beginning of period | 107,240.1 | 131,188.6
Premiums and deposits | 11,379.0 | 14,859.3
Policy charges | (366.0) | (383.7)
Surrenders, withdrawals and benefit payments | (13,916.8) | (14,479.4)
Investment performance | 15,820.7 | (20,641.3)
Net transfers (to) from general account | (2,461.1) | (2,571.7)
Other | (177.4) | (731.7)
Balance at end of period | 117,518.5 | 107,240.1
Cash surrender value | 116,522.1 | 106,125.7
Retirement and Income Solutions | Individual variable annuities |  |
Changes in separate account liabilities |  |
Balance at beginning of period | 8,659.0 | 11,000.0
Premiums and deposits | 328.5 | 354.1
Policy charges | (204.5) | (211.1)
Surrenders, withdrawals and benefit payments | (1,018.2) | (790.1)
Investment performance | 1,315.1 | (1,723.3)
Net transfers (to) from general account | 30.4 | 29.4
Other | 21.6 |
Balance at end of period | 9,131.9 | 8,659.0
Cash surrender value | $ 9,011.5 | $ 8,538.7

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