Separate Account Assets and Liabilities - Separate account liabilities (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	$ 95,585	$ 93,888
Premiums and deposits	2,915	2,706
Policy charges	(1,397)	(1,394)
Surrenders and withdrawals	(8,249)	(7,423)
Benefit payments	(1,364)	(1,222)
Investment performance	7,610	10,623
Net transfers from (to) general account and other	(393)	(348)
balance, end of period	94,707	96,830
Cash surrender value	93,819	95,874
Group Retirement
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	40,701	39,672
Premiums and deposits	1,026	1,027
Policy charges	(362)	(349)
Surrenders and withdrawals	(3,648)	(3,306)
Benefit payments	(465)	(466)
Investment performance	4,332	5,004
Net transfers from (to) general account and other	(419)	(413)
balance, end of period	41,165	41,169
Cash surrender value	41,081	41,078
Life Insurance
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	1,149	1,059
Premiums and deposits	22	25
Policy charges	(32)	(34)
Surrenders and withdrawals	(30)	(31)
Benefit payments	(11)	(10)
Investment performance	115	143
Net transfers from (to) general account and other	(5)	(5)
balance, end of period	1,208	1,147
Cash surrender value	1,198	1,126
Institutional Markets
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	4,957	4,339
Premiums and deposits	613	621
Policy charges	(99)	(95)
Surrenders and withdrawals	(136)	(222)
Benefit payments	(85)	(14)
Investment performance	204	241
Net transfers from (to) general account and other	(11)	26
balance, end of period	5,443	4,896
Cash surrender value	5,439	4,898
Corporate & Other
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	48,778	48,818
Premiums and deposits	1,254	1,033
Policy charges	(904)	(916)
Surrenders and withdrawals	(4,435)	(3,864)
Benefit payments	(803)	(732)
Investment performance	2,959	5,235
Net transfers from (to) general account and other	42	44
balance, end of period	46,891	49,618
Cash surrender value	$ 46,101	$ 48,772

Transfer to (from) Policyholder Account Balance (to) from General Account

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- Definition

Amount of cash outflow to separate account policyholder from benefit payment.

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- Definition

Amount of separate account liability payable to policyholder upon surrender of contract before maturity.

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Amount of increase (decrease) in separate account liability from performance of investment.

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Amount of decrease in separate account liability from policy charge.

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- Definition

Amount of cash inflow to separate account liability from premium and deposit from cash received.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of decrease in separate account liability from contract redemption and withdrawal of funds.

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- Definition

Amount of liability for variable contract in which all or portion of contract holder's funds is allocated to specific separate account and supported by assets held in separate account.

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