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Investments, Available-for-Sale Securities in Gross Unrealized Loss Position (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 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 | 2,786 | $ 1,666
12 months or longer | 351 | 64
Total | 3,137 | 1,730
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 55 | 74
12 months or longer | 15 | 3
Total | 70 | 77
Corporate and Other Bonds [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 1,190 | 609
12 months or longer | 61 | 12
Total | 1,251 | 621
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 33 | 21
12 months or longer | 2 | 1
Total | 35 | 22
States, Municipalities and Political Subdivisions [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 128 | 33
Total | 128 | 33
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 2 |
Total | 2 |
Total Asset-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 1,340 | 948
12 months or longer | 290 | 52
Total | 1,630 | 1,000
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 14 | 50
12 months or longer | 13 | 2
Total | 27 | 52
Residential Mortgage-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 932 | 71
12 months or longer | 10 | 11
Total | 942 | 82
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 10 | 1
Total | 10 | 1
Commercial Mortgage-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 153 | 533
12 months or longer | 206 | 28
Total | 359 | 561
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 2 | 40
12 months or longer | 12 | 2
Total | 14 | 42
Other Asset-Backed [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 255 | 344
12 months or longer | 74 | 13
Total | 329 | 357
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 2 | 9
12 months or longer | 1 |
Total | 3 | 9
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 80 | 63
Total | 80 | 63
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 5 | 3
Total | 5 | 3
Foreign Government [Member] |  |
Estimated Fair Value [Abstract] |  |
Less than 12 months | 48 | 13
Total | 48 | $ 13
Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 1 |
Total | $ 1 |

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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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