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Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Total asset derivatives | $ 722 | $ 575
Total liability derivatives | 3,866 | 3,505
Call options | Derivative investments |  |
Derivative [Line Items] |  |
Total asset derivatives | 690 | 548
Futures contracts | Derivative investments |  |
Derivative [Line Items] |  |
Total asset derivatives | 1 | 0
Foreign currency forward | Derivative investments |  |
Derivative [Line Items] |  |
Total asset derivatives | 1 | 0
Other embedded derivatives | Other long-term investments |  |
Derivative [Line Items] |  |
Total asset derivatives | 30 | 27
FIA embedded derivative | Contractholder funds |  |
Derivative [Line Items] |  |
Total liability derivatives | 3,759 | 3,404
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities | Accounts payable and accrued liabilities: |  |
Derivative [Line Items] |  |
Total liability derivatives | $ 107 | $ 101

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