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Market Risk Benefits - Balances of and Changes in Market Risk Benefits (Details) - 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
Market Risk Benefit [Roll Forward] |  |  |  |  |
Beginning balance | $ (629) | $ 1,133 | $ 335 | $ 1,103 | $ 1,103
Issuances | 7 | 4 | 12 | 8 | 17
Interest accrual and time decay | (15) | 5 | (25) | (21) | (53)
Reserve increase from attributed fees collected | 195 | 194 | 379 | 383 | 788
Reserve release for benefit payments and derecognition | (3) | (9) | (7) | (18) | (35)
Effect of changes in interest rates and bond markets | (245) | (588) | (772) | (84) | (367)
Effect of changes in equity markets and subaccount performance | (152) | (510) | (882) | (902) | (1,267)
Effect of changes in equity index volatility | 15 | (27) | 54 | (70) | (67)
Actual policyholder behavior different from expected behavior | 10 | (1) | 41 | 6 | 5
Effect of changes in other future expected assumptions |  |  |  |  | 128
Effect of changes in the instrument-specific credit risk on market risk benefits | (13) | 159 | 35 | (45) | 83
Ending balance | (830) | 360 | (830) | 360 | 335
Reconciliation of the gross balances in an asset or liability position: |  |  |  |  |
Asset position | 2,082 | 1,346 | 2,082 | 1,346 | 1,427
Liability position | (1,252) | (1,706) | (1,252) | (1,706) | (1,762)
Net asset (liability) position | $ 830 | $ (360) | $ 830 | $ (360) | $ (335)
Weighted average attained age of contractholders | 69 years | 68 years | 69 years | 68 years | 69 years
Changes in unrealized (gains) losses in net income relating to liabilities held at end of period | $ (402) | $ (1,112) | $ (1,588) | $ (1,049) | $ (1,551)
Changes in unrealized (gains) losses in other comprehensive income relating to liabilities held at end of period | (11) | 158 | 40 | (44) | 84
Death benefits |  |  |  |  |
Reconciliation of the gross balances in an asset or liability position: |  |  |  |  |
Guaranteed benefit amount in excess of current account balances (net amount at risk) | 530 | 1,415 | 530 | 1,415 | 913
Living benefits |  |  |  |  |
Reconciliation of the gross balances in an asset or liability position: |  |  |  |  |
Guaranteed benefit amount in excess of current account balances (net amount at risk) | 2,317 | 2,725 | 2,317 | 2,725 | 2,513
Composite (greater of) |  |  |  |  |
Reconciliation of the gross balances in an asset or liability position: |  |  |  |  |
Guaranteed benefit amount in excess of current account balances (net amount at risk) | $ 2,775 | $ 3,977 | $ 2,775 | $ 3,977 | $ 3,308

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- Definition Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29G -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29G Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480112/944-40-45-3 + Details
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