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Market Risk Benefits - Balances of and Changes in Market Risk Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Market Risk Benefit [Roll Forward] |  |  |  |
Beginning balance | $ 1,103 | $ 2,901 |  | $ 4,829
Issuances | 17 | 27 |  | 45
Interest accrual and time decay | (53) | (237) |  | (294)
Reserve increase from attributed fees collected | 788 | 810 |  | 819
Reserve release for benefit payments and derecognition | (35) | (29) |  | (8)
Effect of changes in interest rates and bond markets | (367) | (4,193) |  | (1,053)
Effect of changes in equity markets and subaccount performance | (1,267) | 2,258 |  | (1,558)
Effect of changes in equity index volatility | (67) | 205 |  | 73
Actual policyholder behavior different from expected behavior | 5 | 17 |  | 52
Effect of changes in other future expected assumptions | 128 | (139) |  | 123
Effect of changes in the instrument-specific credit risk on market risk benefits | 83 | (517) |  | (127)
Ending balance | 335 | 1,103 |  | 2,901
Reconciliation of the gross balances in an asset or liability position: |  |  |  |
Asset position | 1,427 | 1,015 | [1] | 539
Liability position | (1,762) | (2,118) | [1] | (3,440)
Net asset (liability) position | $ (335) | $ (1,103) |  | $ (2,901)
Weighted average attained age of contractholders | 69 years | 68 years |  | 68 years
Changes in unrealized (gains) losses in net income relating to liabilities held at end of period | $ (1,551) | $ (2,044) |  | $ (2,502)
Changes in unrealized (gains) losses in other comprehensive income relating to liabilities held at end of period | 84 | (505) |  | (102)
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) | 913 | 2,781 |  | 251
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) | 2,513 | 3,364 |  | 195
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) | $ 3,308 | 5,830 |  | 441
Previously Reported |  |  |  |
Market Risk Benefit [Roll Forward] |  |  |  |
Beginning balance |  |  |  | 3,084
Reconciliation of the gross balances in an asset or liability position: |  |  |  |
Asset position |  | 0 |  | 0
Liability position |  | $ 0 |  | 0
Net asset (liability) position |  |  |  |
Effect of shadow reserve adjustments |  |  |  |
Market Risk Benefit [Roll Forward] |  |  |  |
Beginning balance |  |  |  | (3)
Reconciliation of the gross balances in an asset or liability position: |  |  |  |
Net asset (liability) position |  |  |  |
Adjustments for the cumulative effect of the changes in instrument-specific credit risk on market risk benefits between the original contract issuance date and the transition date |  |  |  |
Market Risk Benefit [Roll Forward] |  |  |  |
Beginning balance |  |  |  | 670
Reconciliation of the gross balances in an asset or liability position: |  |  |  |
Net asset (liability) position |  |  |  |
Adjustments to the host contract for differences between previous carrying amount and fair value measurement for the market risk benefits under the option-based method of valuation |  |  |  |
Market Risk Benefit [Roll Forward] |  |  |  |
Beginning balance |  |  |  | 20
Reconciliation of the gross balances in an asset or liability position: |  |  |  |
Net asset (liability) position |  |  |  |
Adjustments for the remaining difference (exclusive of the instrument-specific credit risk change and host contract adjustments) between previous carrying amount and fair value measurements for the market risk benefits |  |  |  |
Market Risk Benefit [Roll Forward] |  |  |  |
Beginning balance |  |  |  | $ 1,058
Reconciliation of the gross balances in an asset or liability position: |  |  |  |
Net asset (liability) position |  |  |  |
[1] | Certain prior period amounts have been restated. See Note 3 for more information.

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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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