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Investments (allowance for credit losses rollforward) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020
Rollforward of available-for-Sale securities allowance for credit losses |  |  |
Beginning Balance | $ (2) |  |
Ending Balance | (30) | $ (30) |
Corporate debt securities [Member] |  |  |
Rollforward of available-for-Sale securities allowance for credit losses |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 0 | 13 |
Available-for-sale securities [Member] |  |  |
Rollforward of available-for-Sale securities allowance for credit losses |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded |  | 13 |
Corporate debt securities [Member] |  |  |
Rollforward of available-for-Sale securities allowance for credit losses |  |  |
Beginning Balance | 13 | 0 | [1]
Ending Balance | 13 | 13 |
Asset backed securities [Member] |  |  |
Rollforward of available-for-Sale securities allowance for credit losses |  |  |
Beginning Balance | 1 | 0 | [1]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 0 | 0 |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | 0 | 1 |
Ending Balance | 1 | 1 |
Available-for-sale securities [Member] |  |  |
Rollforward of available-for-Sale securities allowance for credit losses |  |  |
Beginning Balance | 14 | 0 | [1]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 0 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | 0 | 1 |
Ending Balance | $ 14 | $ 14 |
[1] | Prior to January 1, 2020, credit losses on Available-for-Sale securities were not recorded in an allowance but were recorded as a reduction of the book value of the security if the security was other-than-temporarily impaired. There is no adoption impact due to the prospective transition for Available-for-Sale securities.

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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=121582814&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=121582814&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=121645371&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=121558606&loc=SL82898722-210454 + Details
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- Definition Amount of expense 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), for which no credit loss was previously recorded. + 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 (b) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of expense (reversal of expense) for 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), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + 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 (f) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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