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Summary of Balances of and Changes in Market Risk Benefits (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Market Risk Benefit [Line Items] |  |  |
Beginning balance |  | $ 582 |
Ending balance |  | 446 | $ 582
Fixed Indexed Annuities |  |  |
Market Risk Benefit [Line Items] |  |  |
Beginning balance |  | 55 | 52
Beginning balance before effect of changes in instrument-specific credit risk |  | 52 | 50
Issuances |  | 0 | 0
Interest accretion |  | 1 | 3
Attributed fees collected |  | 3 | 5
Benefit payments |  | 0 | 0
Effect of changes in interest rates |  | (10) | (2)
Effect of changes in equity markets |  | (1) | (2)
Actual policyholder behavior different from expected behavior |  | (2) | (2)
Effect of changes in future expected policyholder behavior |  | 0 | 0
Effect of changes in other future expected assumptions |  | 0 | 0
Other |  | (2) | 0
Ending balance before effect of changes in instrument-specific credit risk |  | 41 | 52
Effect of changes in instrument-specific credit risk |  | 2 | 3
Ending balance |  | 43 | 55
Less: reinsurance recoverable |  | 0 | 0
Market risk benefits, net of reinsurance recoverable |  | $ 43 | $ 55
Weighted-average attained age of contractholders |  | 73 years | 73 years
Net amount at risk | [1] |  |
Variable Annuities |  |  |
Market Risk Benefit [Line Items] |  |  |
Beginning balance |  | 527 | 670
Beginning balance before effect of changes in instrument-specific credit risk |  | 520 | 660
Issuances |  | 0 | 0
Interest accretion |  | 14 | 34
Attributed fees collected |  | 19 | 37
Benefit payments |  | (15) | (35)
Effect of changes in interest rates |  | (78) | (33)
Effect of changes in equity markets |  | (64) | (157)
Actual policyholder behavior different from expected behavior |  | 2 | 8
Effect of changes in future expected policyholder behavior |  | 0 | 11
Effect of changes in other future expected assumptions |  | 0 | 0
Other |  | 0 | (5)
Ending balance before effect of changes in instrument-specific credit risk |  | 398 | 520
Effect of changes in instrument-specific credit risk |  | 5 | 7
Ending balance |  | 403 | 527
Less: reinsurance recoverable |  | 117 | 140
Market risk benefits, net of reinsurance recoverable |  | $ 286 | $ 387
Weighted-average attained age of contractholders |  | 76 years | 76 years
Net amount at risk | [1] |  |
Reinsurance recoverable |  |  |
Market Risk Benefit [Line Items] |  |  |
Beginning balance | [2] | 140 | 158
Beginning balance before effect of changes in instrument-specific credit risk | [2] | 140 | 158
Issuances | [2] | 0 | 0
Interest accretion | [2] | 4 | 9
Attributed fees collected | [2] | 4 | 8
Benefit payments | [2] | (7) | (15)
Effect of changes in interest rates | [2] | (14) | (5)
Effect of changes in equity markets | [2] | (13) | (31)
Actual policyholder behavior different from expected behavior | [2] | 3 | 5
Effect of changes in future expected policyholder behavior | [2] | 0 | 11
Effect of changes in other future expected assumptions | [2] | 0 | 0
Other | [2] | 0 | 0
Ending balance before effect of changes in instrument-specific credit risk | [2] | 117 | 140
Effect of changes in instrument-specific credit risk | [2] | 0 | 0
Ending balance | [2] | 117 | 140
Net amount at risk | [1],[2] |  |
[1] | See note 9 for additional information on the net amount at risk.
[2] | Represents the net reinsured asset related to our variable annuity MRBs.

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- Definition Weighted average attained age of policyholders or contract holders in the specified guarantee type and subset of guarantee class, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479808/944-20-55-15 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph ((d)(5)) -SubTopic 80 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480109/944-80-50-1 + Details
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