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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Net Investment Income [Line Items] |  |  |  |  |
Investment revenue | $ 2,962 | $ 1,915 | $ 5,597 | $ 3,789 |
Investment funds | 15,868 |  | 15,868 |  | $ 14,128
Investment expenses | (245) | (189) | (473) | (380) |
Net investment income | 2,717 | 1,726 | 5,124 | 3,409 |
Trading securities |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment revenue | 44 | 49 | 86 | 112 |
Equity securities |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment revenue | 25 | 9 | 40 | 24 |
Mortgage loans |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment revenue | 543 | 297 | 990 | 534 |
Investment funds |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment expenses | 29 | 104 | 72 | 408 |
Funds withheld at interest |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment revenue | 453 | 476 | 882 | 813 |
Other |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment revenue | 219 | 48 | 409 | 90 |
Available-for-sale Securities |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investment revenue | $ 1,649 | $ 932 | $ 3,118 | $ 1,808 |

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-10 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
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