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Investments (Net Investment Income) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | $ 19,066 | $ 16,887 | $ 18,946
Less: investment expenses | (1,201) | (850) | (659)
Net investment income | 17,865 | 16,037 | 18,287
Assets supporting experience-rated contractholder liabilities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 45 | 167 | 601
Equity securities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 197 | 160 | 162
Commercial mortgage and other loans |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 2,279 | 2,196 | 2,552
Policy loans |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 499 | 499 | 533
Other invested assets |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 1,347 | 1,240 | 2,617
Short-term investments and cash equivalents |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 954 | 406 | 63
Available-for-sale | Fixed maturities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 13,305 | 11,773 | 11,999
Held-to-maturity | Fixed maturities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | 148 | 213 | 226
Trading | Fixed maturities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross investment income | $ 292 | $ 233 | $ 193

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