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Separate Accounts (Separate Account Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | $ 198,888 | $ 197,679
U.S. Treasury securities and obligations of U.S. government authorities and agencies |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 4,411 | 5,208
Obligations of U.S. states and their political subdivisions |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 2,116 | 2,006
Foreign government bonds |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 101 | 120
U.S. corporate securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 12,782 | 13,135
Foreign corporate securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 3,288 | 3,261
Asset-backed securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 1,211 | 1,131
Mortgage-backed securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 14,253 | 14,653
Equity |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 88,397 | 82,781
Fixed Income |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 37,065 | 38,109
Other |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 5,587 | 3,797
Equity securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 5,410 | 5,177
Commercial mortgage and other loans |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 67 | 74
Other invested assets |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 20,739 | 24,590
Short-term investments |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 1,202 | 1,306
Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | $ 2,259 | $ 2,331

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