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Investments (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 25,769 | $ 29,064
Gross unrealized gains | 10 | 1
Gross unrealized losses | (127) | (341)
Fair values | 25,652 | 28,724
U.S. Treasury notes [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,709 | 2,710
Gross unrealized gains | 0 | 0
Gross unrealized losses | (27) | (47)
Fair values | 2,682 | 2,663
U.S. Treasury bills [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 3,475 | 8,191
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 3,475 | 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 | (1) | (2)
Fair values | 111 | 110
Other government-related debt securities - Foreign and other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 964 | 972
Gross unrealized gains | 4 | 1
Gross unrealized losses | (10) | (41)
Fair values | 958 | 932
Corporate debt securities - Financial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,771 | 2,778
Gross unrealized gains | 1 | 0
Gross unrealized losses | (22) | (81)
Fair values | 2,750 | 2,697
Corporate debt securities - Industrial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,481 | 2,603
Gross unrealized gains | 4 | 0
Gross unrealized losses | (27) | (99)
Fair values | 2,458 | 2,504
Corporate debt securities - Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 572 | 583
Gross unrealized gains | 1 | 0
Gross unrealized losses | (7) | (21)
Fair values | 566 | 562
Residential mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 1,404 | 1,458
Gross unrealized gains | 0 | 0
Gross unrealized losses | (22) | (36)
Fair values | 1,382 | 1,422
Other mortgage- and asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 478 | 483
Gross unrealized gains | 0 | 0
Gross unrealized losses | (11) | (14)
Fair values | 467 | 469
Money market mutual funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 4,375 | 5,659
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 4,375 | 5,659
Other short-term interest-bearing securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 6,428 | 3,515
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | $ 6,428 | $ 3,515

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