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Policyholder Account Balances - Summary of Changes in Policyholder Account Balance (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | $ 15,540 |  |
Net transfers from separate accounts |  |  |  | (2) |  | $ 1
Interest credited |  | $ 125 | $ 126 | 250 | $ 252 |
Ending balance |  | 15,047 |  | 15,047 |  | 15,540
Life Insurance |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | 7,460 | 7,694 | 7,694
Issuances |  |  |  | 0 |  | 0
Premiums received |  |  |  | 239 |  | 500
Policy charges |  |  |  | (302) |  | (614)
Surrenders and withdrawals |  |  |  | (125) |  | (272)
Benefit payments |  |  |  | (126) |  | (215)
Net transfers from separate accounts |  |  |  | 0 |  | 0
Interest credited |  |  |  | 197 |  | 388
Other |  |  |  | (2) |  | (21)
Ending balance |  | $ 7,341 |  | $ 7,341 |  | $ 7,460
Weighted-average crediting rate |  | 3.90% |  | 3.90% |  | 3.90%
Net amount at risk | [1] | $ 42,187 |  | $ 42,187 |  | $ 42,754
Cash surrender value |  | 4,189 |  | 4,189 |  | 4,336
Fixed Annuities |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | 4,479 | 5,477 | 5,477
Issuances |  |  |  | 0 |  | 0
Premiums received |  |  |  | 12 |  | 20
Policy charges |  |  |  | (3) |  | (6)
Surrenders and withdrawals |  |  |  | (296) |  | (842)
Benefit payments |  |  |  | (173) |  | (387)
Net transfers from separate accounts |  |  |  | 0 |  | 0
Interest credited |  |  |  | 73 |  | 160
Other |  |  |  | 21 |  | 57
Ending balance |  | $ 4,113 |  | $ 4,113 |  | $ 4,479
Weighted-average crediting rate |  | 2.90% |  | 2.90% |  | 2.80%
Net amount at risk | [1] | $ 21 |  | $ 21 |  | $ 33
Cash surrender value |  | 3,185 |  | 3,185 |  | 3,519
Variable Annuities |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | 529 | $ 610 | 610
Issuances |  |  |  | 0 |  | 0
Premiums received |  |  |  | 7 |  | 14
Policy charges |  |  |  | (2) |  | (6)
Surrenders and withdrawals |  |  |  | (32) |  | (66)
Benefit payments |  |  |  | (27) |  | (80)
Net transfers from separate accounts |  |  |  | (2) |  | 1
Interest credited |  |  |  | 2 |  | 4
Other |  |  |  | 17 |  | 52
Ending balance |  | $ 492 |  | $ 492 |  | $ 529
Weighted-average crediting rate |  | 3.30% |  | 3.30% |  | 3.30%
Net amount at risk | [1] | $ 401 |  | $ 401 |  | $ 479
Cash surrender value |  | $ 492 |  | $ 492 |  | $ 529
[1] | The net amount at risk presented for fixed and variable annuity products contains both general and separate accounts, including amounts related to annuitization and other insurance benefits classified as MRBs.

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- Definition Amount of cash to be paid to policyholder upon termination and surrender of long-duration contract issued by insurance entity. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7A + Details
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- Definition Amount of cash outflow to policyholder account balance from benefit payment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13J -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13J Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7A + Details
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- Definition Amount of increase (decrease) in liability for policyholder account balance from change, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7A + Details
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- Definition Amount of increase in liability for policyholder account balance from contract issuance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13J -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13J Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7A + Details
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- Definition Amount of guaranteed benefit in excess of current account balance of policyholder account balance. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29F Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7A + Details
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