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Investments, Available-for-sale Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Available-For-Sale Impairment Losses [Abstract] |  |  |  |
Losses on mortgage loans due to changes in expected credit losses | $ 0 | $ 0 | $ 0 | $ 13
Fixed Maturity Securities Available-for-sale [Member] |  |  |  |
Available-For-Sale Impairment Losses [Abstract] |  |  |  |
Impairment losses (gains) recognized in earnings | (1) | 11 | 5 | 103
Fixed Maturity Securities Available-for-sale [Member] | Corporate and Other Bonds [Member] |  |  |  |
Available-For-Sale Impairment Losses [Abstract] |  |  |  |
Impairment losses (gains) recognized in earnings | (2) | (1) | $ 5 | 90
Fixed Maturity Securities Available-for-sale [Member] | Asset-Backed [Member] |  |  |  |
Available-For-Sale Impairment Losses [Abstract] |  |  |  |
Impairment losses (gains) recognized in earnings | $ 1 | $ 12 |  | $ 13

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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562 + Details
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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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