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Investments (Rollforward of expected credit-losses, AFS) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 12 | $ 34 | $ 12 | $ 34 | $ 11 |  | $ 20 | $ 69 |  | $ 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 0 | 0 | 0 | 5 |  |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Recovery | (2) | (40) | (16) | (174) |  |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff | 0 | 0 | 0 | (5) |  |  |  |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss |  |  |  |  |  | $ 0 |  |  | $ 25 |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | $ 3 | $ 5 | $ 8 | $ 183 |  |  |  |  |  |

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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