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Investments (Rollforward of expected credit losses HTM) (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, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | $ 35 | $ 45 | $ 35 | $ 45 | $ 37 |  | $ 44 | $ 51 |  | $ 0
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Recovery | (2) | (8) | (9) | (8) |  |  |  |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss |  |  |  |  |  | $ 0 |  |  | $ 44 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Period Increase (Decrease) | $ 0 | $ 2 | $ 0 | $ 9 |  |  |  |  |  |

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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + 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 (a) -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 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount of increase (decrease) in allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount of increase in allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity), from recovery. + 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 (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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