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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
Net Investment Income [Line Items] |  |  |
Less: Investment expenses | $ 2,262 | $ 1,284 | $ 949
Net investment income | 19,908 | 15,916 | 21,395
Securities Investment |  |  |
Net Investment Income [Line Items] |  |  |
Gross Investment Income, Operating | 20,987 | 18,498 | 21,392
Net investment income | 18,725 | 17,214 | 20,443
Fixed maturity securities AFS |  |  |
Net Investment Income [Line Items] |  |  |
Gross Investment Income, Operating | 12,990 | 11,490 | 10,996
Equity Securities |  |  |
Net Investment Income [Line Items] |  |  |
Gross Investment Income, Operating | 32 | 36 | 36
FVO securities |  |  |
Net Investment Income [Line Items] |  |  |
Net investment income | 188 | (127) | 167
Mortgage loans |  |  |
Net Investment Income [Line Items] |  |  |
Gross Investment Income, Operating | 4,761 | 3,539 | 3,435
Policy loans |  |  |
Net Investment Income [Line Items] |  |  |
Gross Investment Income, Operating | 471 | 460 | 474
Real Estate and Real Estate Joint Ventures |  |  |
Net Investment Income [Line Items] |  |  |
Gross Investment Income, Operating | 438 | 1,200 | 954
OLPI |  |  |
Net Investment Income [Line Items] |  |  |
Gross Investment Income, Operating | 454 | 858 | 4,927
Cash, cash equivalents and short-term investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross Investment Income, Operating | 1,011 | 358 | 103
Operating joint ventures |  |  |
Net Investment Income [Line Items] |  |  |
Gross Investment Income, Operating | 38 | 51 | 77
Other Investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross Investment Income, Operating | 604 | 633 | 223
Unit-linked investments |  |  |
Net Investment Income [Line Items] |  |  |
Net investment income | $ 1,183 | $ (1,298) | $ 952

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