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Investments (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 21,072 | $ 29,064
Gross unrealized gains | 67 | 1
Gross unrealized losses | (22) | (341)
Fair values | 21,117 | 28,724
U.S. Treasury notes [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,709 | 2,710
Gross unrealized gains | 10 | 0
Gross unrealized losses | (2) | (47)
Fair values | 2,717 | 2,663
U.S. Treasury bills [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 3,497 | 8,191
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 3,497 | 8,191
Other government-related debt securities - U.S. [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 112 | 112
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | (2)
Fair values | 112 | 110
Other government-related debt securities - Foreign and other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 962 | 972
Gross unrealized gains | 18 | 1
Gross unrealized losses | (3) | (41)
Fair values | 977 | 932
Corporate debt securities - Financial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,755 | 2,778
Gross unrealized gains | 19 | 0
Gross unrealized losses | (1) | (81)
Fair values | 2,773 | 2,697
Corporate debt securities - Industrial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,400 | 2,603
Gross unrealized gains | 14 | 0
Gross unrealized losses | (6) | (99)
Fair values | 2,408 | 2,504
Corporate debt securities - Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 558 | 583
Gross unrealized gains | 4 | 0
Gross unrealized losses | 0 | (21)
Fair values | 562 | 562
Residential mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 1,335 | 1,458
Gross unrealized gains | 2 | 0
Gross unrealized losses | (4) | (36)
Fair values | 1,333 | 1,422
Other mortgage- and asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 469 | 483
Gross unrealized gains | 0 | 0
Gross unrealized losses | (6) | (14)
Fair values | 463 | 469
Money market mutual funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 3,886 | 5,659
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 3,886 | 5,659
Other short-term interest-bearing securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,389 | 3,515
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | $ 2,389 | $ 3,515

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