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v3.20.4

Reserve for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Details) - Group Benefits - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Prior accident year development [1] | $ (445) | $ (410) | $ (324)
Group long-term disability |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Prior accident year development [1] | 365 | 340 | 230
Group life and accident, excluding premium waiver |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Prior accident year development [1] | 65 | $ 60 | $ 90
Group supplemental health |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Prior accident year development [1] | $ 15 |  |

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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