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Investments, Available-for-Sale Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Gross Unrealized Losses [Abstract] |  |
Additional impairment losses | $ 0 |
Fixed Maturity Securities [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 4,927 | $ 1,666
12 months or longer | 341 | 64
Total | 5,268 | 1,730
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 71 | 74
12 months or longer | 18 | 3
Total | 89 | 77
Corporate and Other Bonds [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 1,853 | 609
12 months or longer | 88 | 12
Total | 1,941 | 621
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 37 | 21
12 months or longer | 5 | 1
Total | 42 | 22
States, Municipalities and Political Subdivisions [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 885 | 33
Total | 885 | 33
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 15 |
Total | 15 |
Total Asset-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 2,051 | 948
12 months or longer | 252 | 52
Total | 2,303 | 1,000
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 13 | 50
12 months or longer | 13 | 2
Total | 26 | 52
Residential Mortgage-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 1,295 | 71
12 months or longer |  | 11
Total | 1,295 | 82
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 6 | 1
Total | 6 | 1
Commercial Mortgage-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 317 | 533
12 months or longer | 194 | 28
Total | 511 | 561
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 4 | 40
12 months or longer | 12 | 2
Total | 16 | 42
Other Asset-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 439 | 344
12 months or longer | 58 | 13
Total | 497 | 357
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 3 | 9
12 months or longer | 1 |
Total | 4 | 9
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 65 | 63
12 months or longer | 1 |
Total | 66 | 63
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 4 | 3
Total | 4 | 3
Foreign Government [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 73 | 13
Total | 73 | $ 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=124269663&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=123581744&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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