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Investments (Unrealized Losses and Fair Values) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | $ 546 | $ 6,838
Less than 12 months, Unrealized losses | (3) | (226)
12 months or more, Fair values | 2,833 | 4,360
12 months or more, Unrealized losses | (19) | (115)
U.S. Treasury notes [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 105 | 1,219
Less than 12 months, Unrealized losses | 0 | (21)
12 months or more, Fair values | 724 | 1,444
12 months or more, Unrealized losses | (2) | (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 | 48 | 110
12 months or more, Unrealized losses | 0 | (2)
Other government-related debt securities - Foreign and other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 6 | 631
Less than 12 months, Unrealized losses | 0 | (31)
12 months or more, Fair values | 115 | 240
12 months or more, Unrealized losses | (3) | (10)
Corporate debt securities - Financial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 121 | 1,968
Less than 12 months, Unrealized losses | 0 | (59)
12 months or more, Fair values | 320 | 718
12 months or more, Unrealized losses | (1) | (22)
Corporate debt securities - Industrial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 191 | 1,898
Less than 12 months, Unrealized losses | (3) | (81)
12 months or more, Fair values | 500 | 529
12 months or more, Unrealized losses | (3) | (18)
Corporate debt securities - Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 30 | 529
Less than 12 months, Unrealized losses | 0 | (20)
12 months or more, Fair values | 40 | 28
12 months or more, Unrealized losses | 0 | (1)
Residential mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 93 | 576
Less than 12 months, Unrealized losses | 0 | (14)
12 months or more, Fair values | 685 | 840
12 months or more, Unrealized losses | (4) | (22)
Other mortgage- and asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 0 | 17
Less than 12 months, Unrealized losses | 0 | 0
12 months or more, Fair values | 401 | 451
12 months or more, Unrealized losses | $ (6) | $ (14)

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