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Investments, Available-for-Sale Other Asset-backed Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Available-for-sale Securities [Abstract] |  |
Additional impairment losses | $ 0 |
Other Asset-Backed [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 133 | $ 4
Estimated fair value | 1,519 | $ 482
Other Asset-Backed [Member] | AAA [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 1 |
Estimated fair value | 49 |
Other Asset-Backed [Member] | AA [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 2 |
Estimated fair value | 83 |
Other Asset-Backed [Member] | A [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 74 |
Estimated fair value | 821 |
Other Asset-Backed [Member] | BBB [ Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 56 |
Estimated fair value | 566 |
Other Asset-Backed [Member] | Auto [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 6 |
Estimated fair value | 290 |
Other Asset-Backed [Member] | Franchise [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 39 |
Estimated fair value | 414 |
Other Asset-Backed [Member] | Collateralized Loan Obligations [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 60 |
Estimated fair value | 418 |
Other Asset-Backed [Member] | Other [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 28 |
Estimated fair value | $ 397 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 + Details
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