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Investments - Unrealized Losses and Fair Values (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair values |  | $ 6,838 |
Less than 12 months, Unrealized losses |  | (226) |
12 months or more, Fair values |  | 4,360 |
12 months or more, Unrealized losses |  | (115) |
Total realized losses | $ 36 | 394 | $ 213
U.S. Treasury notes [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair values |  | 1,219 |
Less than 12 months, Unrealized losses |  | (21) |
12 months or more, Fair values |  | 1,444 |
12 months or more, Unrealized losses |  | (26) |
Other government-related debt securities - U.S. [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair values |  | 0 |
Less than 12 months, Unrealized losses |  | 0 |
12 months or more, Fair values |  | 110 |
12 months or more, Unrealized losses |  | (2) |
Other government-related debt securities - Foreign and other [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair values |  | 631 |
Less than 12 months, Unrealized losses |  | (31) |
12 months or more, Fair values |  | 240 |
12 months or more, Unrealized losses |  | (10) |
Corporate debt securities - Financial [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair values |  | 1,968 |
Less than 12 months, Unrealized losses |  | (59) |
12 months or more, Fair values |  | 718 |
12 months or more, Unrealized losses |  | (22) |
Corporate debt securities - Industrial [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair values |  | 1,898 |
Less than 12 months, Unrealized losses |  | (81) |
12 months or more, Fair values |  | 529 |
12 months or more, Unrealized losses |  | (18) |
Corporate debt securities - Other [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair values |  | 529 |
Less than 12 months, Unrealized losses |  | (20) |
12 months or more, Fair values |  | 28 |
12 months or more, Unrealized losses |  | (1) |
Residential mortgage-backed securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair values |  | 576 |
Less than 12 months, Unrealized losses |  | (14) |
12 months or more, Fair values |  | 840 |
12 months or more, Unrealized losses |  | (22) |
Other mortgage- and asset-backed securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Less than 12 months, Fair values |  | 17 |
Less than 12 months, Unrealized losses |  | 0 |
12 months or more, Fair values |  | 451 |
12 months or more, Unrealized losses |  | $ (14) |

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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=118955579&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=118939692&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=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 continuous unrealized loss position for 12 months or longer, 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 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: 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=118955579&loc=SL82922890-210455 + Details
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