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Investments (Unrealized Losses and Fair Values) (Details) $ in Millions | Dec. 31, 2018 USD ($)
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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)
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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