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Investments (Unrealized Losses and Fair Values) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | $ 8,266 | $ 25,250
Less than 12 months, Unrealized losses | (291) | (191)
12 months or more, Fair values | 2,818 | 2,061
12 months or more, Unrealized losses | (106) | (31)
U.S. Treasury notes [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 1,795 | 7,728
Less than 12 months, Unrealized losses | (58) | (70)
12 months or more, Fair values | 831 | 195
12 months or more, Unrealized losses | (26) | (2)
Other government-related debt securities - U.S. [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 43 | 188
Less than 12 months, Unrealized losses | (1) | (1)
12 months or more, Fair values | 66 | 34
12 months or more, Unrealized losses | (2) | (1)
Other government-related debt securities - Foreign and other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 855 | 1,163
Less than 12 months, Unrealized losses | (38) | (9)
12 months or more, Fair values | 74 | 115
12 months or more, Unrealized losses | (3) | (2)
Corporate debt securities - Financial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 2,262 | 5,928
Less than 12 months, Unrealized losses | (74) | (28)
12 months or more, Fair values | 397 | 462
12 months or more, Unrealized losses | (15) | (6)
Corporate debt securities - Industrial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 1,970 | 5,760
Less than 12 months, Unrealized losses | (68) | (43)
12 months or more, Fair values | 318 | 612
12 months or more, Unrealized losses | (12) | (9)
Corporate debt securities - Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 533 | 868
Less than 12 months, Unrealized losses | (21) | (4)
12 months or more, Fair values | 13 | 117
12 months or more, Unrealized losses | 0 | (2)
Residential mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 673 | 1,838
Less than 12 months, Unrealized losses | (27) | (24)
12 months or more, Fair values | 782 | 276
12 months or more, Unrealized losses | (35) | (6)
Other mortgage- and asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair values | 135 | 1,777
Less than 12 months, Unrealized losses | (4) | (12)
12 months or more, Fair values | 337 | 250
12 months or more, Unrealized losses | $ (13) | $ (3)

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