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Investments (Narrative) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) partnerships
Investment [Line Items] |  |  |
Document Period End Date |  | Dec. 31, 2021 |
Limited partnerships number | partnerships |  |  | 130
Restricted assets in fixed maturities and short-term investments |  | $ 17,092 | $ 19,605
Restricted assets in cash |  | $ 152 | $ 89
CHINA | Huatai Group [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage |  | 47.00% | 47.00%
CHINA | Huatai Life Insurance Co. [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage |  | 20.00% | 20.00%
Subsequent Event [Member] | CHINA | Huatai Group [Member] |  |  |
Investment [Line Items] |  |  |
Equity method investment, additional 7.1 percentage obtained | 38.70% |  |
Indirect Ownership [Member] | CHINA | Huatai Life Insurance Co. [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage |  | 37.70% |
Direct Ownership [Member] | CHINA | Huatai Group [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage |  | 47.30% |
Direct Ownership [Member] | CHINA | Huatai Life Insurance Co. [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage |  | 20.00% |

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- Definition For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD. + References No definition available. + Details
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