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Investments (Net Investment Income) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Net Investment Income [Line Items] |  |
Less: Investment expenses | $ 568 | $ 461
Net investment income | 5,436 | 4,645
Securities Investment |  |
Net Investment Income [Line Items] |  |
Gross Investment Income, Operating | 5,462 | 4,802
Net investment income | 4,894 | 4,341
Fixed maturity securities AFS |  |
Net Investment Income [Line Items] |  |
Gross Investment Income, Operating | 3,288 | 3,139
Equity Securities |  |
Net Investment Income [Line Items] |  |
Gross Investment Income, Operating | 7 | 12
FVO securities |  |
Net Investment Income [Line Items] |  |
Gross Investment Income, Operating | 85 | 48
Mortgage loans |  |
Net Investment Income [Line Items] |  |
Gross Investment Income, Operating | 1,194 | 1,041
Policy loans |  |
Net Investment Income [Line Items] |  |
Gross Investment Income, Operating | 113 | 119
Real Estate and Real Estate Joint Ventures |  |
Net Investment Income [Line Items] |  |
Gross Investment Income, Operating | 10 | 26
OLPI |  |
Net Investment Income [Line Items] |  |
Gross Investment Income, Operating | 301 | 25
Cash, cash equivalents and short-term investments |  |
Net Investment Income [Line Items] |  |
Gross Investment Income, Operating | 291 | 217
Operating joint ventures |  |
Net Investment Income [Line Items] |  |
Gross Investment Income, Operating | 22 | 19
Other Investments |  |
Net Investment Income [Line Items] |  |
Gross Investment Income, Operating | 151 | 156
Unit-linked investments |  |
Net Investment Income [Line Items] |  |
Net investment income | $ 542 | $ 304

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