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Separate Account Balances - Retirement and Income Solutions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Changes in separate account liabilities
Balance at beginning of period	$ 167,605.6
Balance at end of period	173,327.1	$ 167,605.6
Retirement and Income Solutions
Changes in separate account liabilities
Balance at beginning of period	126,650.4
Balance at end of period	133,438.0	126,650.4
Retirement and Income Solutions | Group retirement contracts
Changes in separate account liabilities
Balance at beginning of period	117,518.5	107,240.1
Premiums and deposits	16,573.1	11,379.0
Policy charges	(365.6)	(366.0)
Surrenders, withdrawals and benefit payments	(19,191.4)	(13,916.8)
Investment performance	14,632.1	15,820.7
Net transfers (to) from general account	(4,148.3)	(2,461.1)
Other	84.7	(177.4)
Balance at end of period	125,103.1	117,518.5
Cash surrender value	123,965.4	116,522.1
Retirement and Income Solutions | Individual variable annuities
Changes in separate account liabilities
Balance at beginning of period	9,131.9	8,659.0
Premiums and deposits	344.5	328.5
Policy charges	(197.6)	(204.5)
Surrenders, withdrawals and benefit payments	(1,977.7)	(1,018.2)
Investment performance	1,079.0	1,315.1
Net transfers (to) from general account	(2.1)	30.4
Other	(43.1)	21.6
Balance at end of period	8,334.9	9,131.9
Cash surrender value	$ 8,219.1	$ 9,011.5

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