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Investments (Unrealized Losses and Fair Values) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | $ 5,928 | $ 6,838
Less than 12 months, Unrealized losses | (66) | (226)
12 months or more, Fair values | 4,621 | 4,360
12 months or more, Unrealized losses | (61) | (115)
U.S. Treasury notes [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 1,190 | 1,219
Less than 12 months, Unrealized losses | (11) | (21)
12 months or more, Fair values | 1,452 | 1,444
12 months or more, Unrealized losses | (16) | (26)
Other government-related debt securities - U.S. [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 0 | 0
Less than 12 months, Unrealized losses | 0 | 0
12 months or more, Fair values | 111 | 110
12 months or more, Unrealized losses | (1) | (2)
Other government-related debt securities - Foreign and other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 410 | 631
Less than 12 months, Unrealized losses | (6) | (31)
12 months or more, Fair values | 307 | 240
12 months or more, Unrealized losses | (4) | (10)
Corporate debt securities - Financial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 1,783 | 1,968
Less than 12 months, Unrealized losses | (14) | (59)
12 months or more, Fair values | 822 | 718
12 months or more, Unrealized losses | (8) | (22)
Corporate debt securities - Industrial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 1,516 | 1,898
Less than 12 months, Unrealized losses | (20) | (81)
12 months or more, Fair values | 634 | 529
12 months or more, Unrealized losses | (7) | (18)
Corporate debt securities - Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 454 | 529
Less than 12 months, Unrealized losses | (6) | (20)
12 months or more, Fair values | 36 | 28
12 months or more, Unrealized losses | (1) | (1)
Residential mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 558 | 576
Less than 12 months, Unrealized losses | (9) | (14)
12 months or more, Fair values | 809 | 840
12 months or more, Unrealized losses | (13) | (22)
Other mortgage- and asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 17 | 17
Less than 12 months, Unrealized losses | 0 | 0
12 months or more, Fair values | 450 | 451
12 months or more, Unrealized losses | $ (11) | $ (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. + 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=82897076&loc=d3e27337-111563 + Details
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