Separate Account Assets and Liabilities - Separate account liabilities (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	$ 91,005	$ 84,853
Premiums and deposits	1,432	1,552
Policy charges	(874)	(955)
Surrenders and withdrawals	(4,717)	(3,600)
Benefit payments	(795)	(743)
Investment performance	8,157	8,600
Net transfers from (to) general account and other	(86)	11
Separate accounts balance, end of period	94,122	89,718
Cash surrender value	92,965	88,389
Individual Retirement
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	47,893	45,178
Premiums and deposits	621	807
Policy charges	(570)	(662)
Surrenders and withdrawals	(2,502)	(1,776)
Benefit payments	(478)	(432)
Investment performance	4,208	4,172
Net transfers from (to) general account and other	36	122
Separate accounts balance, end of period	49,208	47,409
Cash surrender value	48,277	46,307
Group Retirement
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	38,188	34,361
Premiums and deposits	712	697
Policy charges	(233)	(221)
Surrenders and withdrawals	(2,145)	(1,390)
Benefit payments	(302)	(250)
Investment performance	3,607	4,169
Net transfers from (to) general account and other	(148)	(121)
Separate accounts balance, end of period	39,679	37,245
Cash surrender value	39,478	37,050
Life Insurance
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	932	799
Premiums and deposits	17	18
Policy charges	(24)	(25)
Surrenders and withdrawals	(17)	(12)
Benefit payments	(4)	(3)
Investment performance	128	113
Net transfers from (to) general account and other	(1)	(2)
Separate accounts balance, end of period	1,031	888
Cash surrender value	1,010	854
Institutional Markets
Separate Account, Liability [Roll Forward]
Separate accounts balance, beginning of year	3,992	4,515
Premiums and deposits	82	30
Policy charges	(47)	(47)
Surrenders and withdrawals	(53)	(422)
Benefit payments	(11)	(58)
Investment performance	214	146
Net transfers from (to) general account and other	27	12
Separate accounts balance, end of period	4,204	4,176
Cash surrender value	$ 4,200	$ 4,178

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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- 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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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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