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Investments (Narrative) (Details) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) partnerships | Dec. 31, 2022 USD ($)
Investment [Line Items] |  |  |
Limited partnerships number | partnerships |  | 174 |
Restricted assets in fixed maturities and short-term investments |  | $ 18,242,000,000 | $ 15,721,000,000
Restricted assets in cash |  | 172,000,000 | $ 115,000,000
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Transfer, Amount | $ 8,200,000,000 |  |
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 7,800,000,000 |  |
Debt Securities, Held-to-Maturity, Transfer, Unrealized Gain (Loss) | $ 428,000,000 |  |
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure |  | $ 153,000,000 |
Huatai Group [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage | 64.20% |  |
CHINA | Huatai Life Insurance Co. [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage |  | 0.00% | 20.00%
CHINA | Huatai Group [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage |  | 0.00% | 47.00%

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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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