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Investments (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Sale of securities receivable | $ 1,100 |
Amortized cost | 20,138 | $ 29,064
Gross unrealized gains | 89 | 1
Gross unrealized losses | 0 | (341)
Fair values | 20,227 | 28,724
U.S. Treasury notes [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 1,164 | 2,710
Gross unrealized gains | 3 | 0
Gross unrealized losses | 0 | (47)
Fair values | 1,167 | 2,663
U.S. Treasury bills [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,494 | 8,191
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 2,494 | 8,191
Other government-related debt securities - U.S. [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 0 | 112
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | (2)
Fair values | 0 | 110
Other government-related debt securities - Foreign and other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 896 | 972
Gross unrealized gains | 29 | 1
Gross unrealized losses | 0 | (41)
Fair values | 925 | 932
Corporate debt securities - Financial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,116 | 2,778
Gross unrealized gains | 24 | 0
Gross unrealized losses | 0 | (81)
Fair values | 2,140 | 2,697
Corporate debt securities - Industrial [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,002 | 2,603
Gross unrealized gains | 23 | 0
Gross unrealized losses | 0 | (99)
Fair values | 2,025 | 2,504
Corporate debt securities - Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 531 | 583
Gross unrealized gains | 6 | 0
Gross unrealized losses | 0 | (21)
Fair values | 537 | 562
Residential mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 512 | 1,458
Gross unrealized gains | 4 | 0
Gross unrealized losses | 0 | (36)
Fair values | 516 | 1,422
Other mortgage- and asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 43 | 483
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | (14)
Fair values | 43 | 469
Money market mutual funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 8,017 | 5,659
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 8,017 | 5,659
Other short-term interest-bearing securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,363 | 3,515
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | $ 2,363 | $ 3,515

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