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Derivative Financial Instruments - Schedule of Change in Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 4 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Derivative [Line Items] |  |  |  |  |
Change in fair value of derivatives | $ 23 | $ (14) |  | $ 23 | $ (35)
Net investment gains (losses) |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Change in fair value of derivatives | 19 | 34 | $ 28 | 309 |
Call options | Net investment gains (losses) |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Change in fair value of derivatives | (6) | 43 | 55 | 273 |
Futures contracts | Net investment gains (losses) |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Change in fair value of derivatives | 0 | 7 | 9 | 4 |
Foreign currency forward | Net investment gains (losses) |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Change in fair value of derivatives | 3 | (4) | (4) | 7 |
Other embedded derivatives | Net investment gains (losses) |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Change in fair value of derivatives | (1) | 2 | 3 | 2 |
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities | Net investment gains (losses) |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Change in fair value of derivatives | 23 | (14) | (35) | 23 |
FIA embedded derivative |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Change in fair value of derivatives | $ (320) | $ 209 | $ 309 | $ 35 |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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