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Investments, Available-for-Sale Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Gross Unrealized Losses [Abstract] |  |
Additional impairment losses | $ 0 |
Fixed Maturity Securities [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 5,085 | $ 1,666
12 months or longer | 476 | 64
Total | 5,561 | 1,730
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 158 | 74
12 months or longer | 24 | 3
Total | 182 | 77
Corporate and Other Bonds [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 1,868 | 609
12 months or longer | 82 | 12
Total | 1,950 | 621
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 66 | 21
12 months or longer | 5 | 1
Total | 71 | 22
States, Municipalities and Political Subdivisions [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 866 | 33
Total | 866 | 33
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 31 |
Total | 31 |
Total Asset-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 2,241 | 948
12 months or longer | 394 | 52
Total | 2,635 | 1,000
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 52 | 50
12 months or longer | 19 | 2
Total | 71 | 52
Residential Mortgage-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 1,584 | 71
12 months or longer | 12 | 11
Total | 1,596 | 82
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 40 | 1
Total | 40 | 1
Commercial Mortgage-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 320 | 533
12 months or longer | 285 | 28
Total | 605 | 561
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 9 | 40
12 months or longer | 15 | 2
Total | 24 | 42
Other Asset-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 337 | 344
12 months or longer | 97 | 13
Total | 434 | 357
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 3 | 9
12 months or longer | 4 |
Total | 7 | 9
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 65 | 63
Total | 65 | 63
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 7 | 3
Total | 7 | 3
Foreign Government [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 45 | 13
Total | 45 | $ 13
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 2 |
Total | $ 2 |

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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 continuous unrealized loss position for more than 12 months, 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 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 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=121590138&loc=SL82922954-210456 + Details
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