Separate Account Assets and Liabilities - Separate account liabilities (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	$ 95,585	$ 93,888
Premiums and deposits	2,104	1,396
Policy charges	(920)	(891)
Surrenders and withdrawals	(5,384)	(4,714)
Benefit payments	(903)	(796)
Investment performance	8,515	5,381
Net transfers from (to) general account and other	(226)	(200)
balance, end of period	98,771	94,064
Cash surrender value	97,926	93,105
Group Retirement
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	40,701	39,672
Premiums and deposits	674	687
Policy charges	(238)	(228)
Surrenders and withdrawals	(2,364)	(2,080)
Benefit payments	(302)	(313)
Investment performance	4,667	2,488
Net transfers from (to) general account and other	(257)	(245)
balance, end of period	42,881	39,981
Cash surrender value	42,795	39,889
Life Insurance
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	1,149	1,059
Premiums and deposits	15	17
Policy charges	(21)	(23)
Surrenders and withdrawals	(18)	(20)
Benefit payments	(5)	(5)
Investment performance	118	73
Net transfers from (to) general account and other	(4)	(3)
balance, end of period	1,234	1,098
Cash surrender value	1,206	1,080
Institutional Markets
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	4,957	4,339
Premiums and deposits	604	72
Policy charges	(72)	(53)
Surrenders and withdrawals	(106)	(100)
Benefit payments	(78)	(5)
Investment performance	223	100
Net transfers from (to) general account and other	8	14
balance, end of period	5,536	4,367
Cash surrender value	5,527	4,368
Corporate & Other
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	48,778	48,818
Premiums and deposits	811	620
Policy charges	(589)	(587)
Surrenders and withdrawals	(2,896)	(2,514)
Benefit payments	(518)	(473)
Investment performance	3,507	2,720
Net transfers from (to) general account and other	27	34
balance, end of period	49,120	48,618
Cash surrender value	$ 48,398	$ 47,768

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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- Definition

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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- Definition

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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- Definition

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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