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Investments (Net Investment Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Net Investment Income [Line Items] |  |  |  |
Less: Investment expenses | $ 564 | $ 681 | $ 1,132 | $ 1,142
Net investment income | 5,205 | 5,072 | 10,641 | 9,717
Securities Investment |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross Investment Income, Operating | 5,550 | 5,458 | 11,012 | 10,260
Net investment income | 4,986 | 4,777 | 9,880 | 9,118
Fixed maturity securities AFS |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross Investment Income, Operating | 3,355 | 3,228 | 6,643 | 6,367
Equity Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross Investment Income, Operating | 7 | 10 | 14 | 22
FVO securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross Investment Income, Operating | 22 | 50 | 107 | 98
Mortgage loans |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross Investment Income, Operating | 1,187 | 1,306 | 2,381 | 2,347
Policy loans |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross Investment Income, Operating | 110 | 119 | 223 | 238
Real Estate and Real Estate Joint Ventures |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross Investment Income, Operating | 80 | 137 | 90 | 163
OLPI |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross Investment Income, Operating | 325 | 225 | 626 | 250
Cash, cash equivalents and short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross Investment Income, Operating | 250 | 248 | 541 | 465
Operating joint ventures |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross Investment Income, Operating | 22 | 13 | 44 | 32
Other Investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross Investment Income, Operating | 192 | 122 | 343 | 278
Unit-linked investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Net investment income | $ 219 | $ 295 | $ 761 | $ 599

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