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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 | 6 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | $ (27) | $ (21) |  | $ 0 | $ (21) |
Net investment gains (losses) |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | 237 |  | $ 290 |  |  | $ (6)
Call options | Net investment gains (losses) |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | 257 |  | 279 |  |  | 12
Futures contracts | Net investment gains (losses) |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | 4 |  | 4 |  |  | 2
Foreign currency forward | Net investment gains (losses) |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | 0 |  | 4 |  |  | 0
Other embedded derivatives | Net investment gains (losses) |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | 3 |  | 3 |  |  | 1
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities | Net investment gains (losses) |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | (27) |  | 0 |  |  | (21)
FIA embedded derivative |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | $ 466 |  | $ 355 |  |  | $ 100

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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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