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Policyholder Account Balances, Future Policy Benefits and Claims and Separate Account Liabilities - Components of Separate Account Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Separate account liabilities |  |
Variable annuity | $ 81,063 | $ 79,299
VUL insurance | 8,931 | 8,226
Other insurance | 32 | 31
Threadneedle investment liabilities | 5,103 | 5,055
Separate account liabilities | $ 95,129 | $ 92,611

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