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Investments (Tables) | 9 Months Ended
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Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security | The amortized cost, gross unrealized gains, gross unrealized losses and fair values of interest-bearing securities, which are considered available-for-sale, by type of security were as follows (in millions):
Types of securities as of September 30, 2019 |  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair values
U.S. Treasury notes |  | $ | 1,164 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 1,167 |
U.S. Treasury bills |  | 2,494 |  |  | — |  |  | — |  |  | 2,494 |
Other government-related debt securities: |  |  |  |  |  |  |  |
U.S. |  | — |  |  | — |  |  | — |  |  | — |
Foreign and other |  | 896 |  |  | 29 |  |  | — |  |  | 925 |
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 2,116 |  |  | 24 |  |  | — |  |  | 2,140 |
Industrial |  | 2,002 |  |  | 23 |  |  | — |  |  | 2,025 |
Other |  | 531 |  |  | 6 |  |  | — |  |  | 537 |
Residential-mortgage-backed securities |  | 512 |  |  | 4 |  |  | — |  |  | 516 |
Other mortgage- and asset-backed securities |  | 43 |  |  | — |  |  | — |  |  | 43 |
Money market mutual funds |  | 8,017 |  |  | — |  |  | — |  |  | 8,017 |
Other short-term interest-bearing securities |  | 2,363 |  |  | — |  |  | — |  |  | 2,363 |
Total interest-bearing securities |  | $ | 20,138 |  |  | $ | 89 |  |  | $ | — |  |  | $ | 20,227 |
Types of securities as of December 31, 2018 |  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair values
U.S. Treasury notes |  | $ | 2,710 |  |  | $ | — |  |  | $ | (47 | ) |  | $ | 2,663 |
U.S. Treasury bills |  | 8,191 |  |  | — |  |  | — |  |  | 8,191 |
Other government-related debt securities: |  |  |  |  |  |  |  |
U.S. |  | 112 |  |  | — |  |  | (2 | ) |  | 110 |
Foreign and other |  | 972 |  |  | 1 |  |  | (41 | ) |  | 932 |
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 2,778 |  |  | — |  |  | (81 | ) |  | 2,697 |
Industrial |  | 2,603 |  |  | — |  |  | (99 | ) |  | 2,504 |
Other |  | 583 |  |  | — |  |  | (21 | ) |  | 562 |
Residential-mortgage-backed securities |  | 1,458 |  |  | — |  |  | (36 | ) |  | 1,422 |
Other mortgage- and asset-backed securities |  | 483 |  |  | — |  |  | (14 | ) |  | 469 |
Money market mutual funds |  | 5,659 |  |  | — |  |  | — |  |  | 5,659 |
Other short-term interest-bearing securities |  | 3,515 |  |  | — |  |  | — |  |  | 3,515 |
Total interest-bearing securities |  | $ | 29,064 |  |  | $ | 1 |  |  | $ | (341 | ) |  | $ | 28,724 |
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets | The fair values of interest-bearing securities by location in the Condensed Consolidated Balance Sheets were as follows (in millions):
Condensed Consolidated Balance Sheets locations |  | September 30, 2019 |  | December 31, 2018
Cash and cash equivalents |  | $ | 10,789 |  |  | $ | 6,365 |
Marketable securities |  | 9,438 |  |  | 22,359 |
Total interest-bearing securities |  | $ | 20,227 |  |  | $ | 28,724 |
Fair values of available-for-sale interest-bearing security investments by contractual maturity | The fair values of interest-bearing securities by contractual maturity, except for mortgage- and asset-backed securities that do not have a single maturity date, were as follows (in millions):
Contractual maturities |  | September 30, 2019 |  | December 31, 2018
Maturing in one year or less |  | $ | 12,941 |  |  | $ | 17,424 |
Maturing after one year through three years |  | 4,855 |  |  | 3,356 |
Maturing after three years through five years |  | 1,226 |  |  | 5,168 |
Maturing after five years through ten years |  | 646 |  |  | 885 |
Mortgage- and asset-backed securities |  | 559 |  |  | 1,891 |
Total interest-bearing securities |  | $ | 20,227 |  |  | $ | 28,724 |
Available-for-sale securities, continuous unrealized loss position, fair value | As of December 31, 2018, the fair values and gross unrealized losses of interest-bearing securities in an unrealized loss position aggregated by type and length of time that the securities have been in a continuous loss position were as follows (in millions):
|  | Less than 12 months |  | 12 months or more
Types of securities as of December 31, 2018 |  | Fair values |  | Unrealized losses |  | Fair values |  | Unrealized losses
U.S. Treasury notes |  | $ | 1,219 |  |  | $ | (21 | ) |  | $ | 1,444 |  |  | $ | (26 | )
Other government-related debt securities: |  |  |  |  |  |  |  |
U.S. |  | — |  |  | — |  |  | 110 |  |  | (2 | )
Foreign and other |  | 631 |  |  | (31 | ) |  | 240 |  |  | (10 | )
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 1,968 |  |  | (59 | ) |  | 718 |  |  | (22 | )
Industrial |  | 1,898 |  |  | (81 | ) |  | 529 |  |  | (18 | )
Other |  | 529 |  |  | (20 | ) |  | 28 |  |  | (1 | )
Residential-mortgage-backed securities |  | 576 |  |  | (14 | ) |  | 840 |  |  | (22 | )
Other mortgage- and asset-backed securities |  | 17 |  |  | — |  |  | 451 |  |  | (14 | )
Total |  | $ | 6,838 |  |  | $ | (226 | ) |  | $ | 4,360 |  |  | $ | (115 | )

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