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Investments (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2019 |  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair values
U.S. Treasury notes |  | $ | 2,709 |  |  | $ | — |  |  | $ | (27 | ) |  | $ | 2,682 |
U.S. Treasury bills |  | 3,475 |  |  | — |  |  | — |  |  | 3,475 |
Other government-related debt securities: |  |  |  |  |  |  |  |
U.S. |  | 112 |  |  | — |  |  | (1 | ) |  | 111 |
Foreign and other |  | 964 |  |  | 4 |  |  | (10 | ) |  | 958 |
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 2,771 |  |  | 1 |  |  | (22 | ) |  | 2,750 |
Industrial |  | 2,481 |  |  | 4 |  |  | (27 | ) |  | 2,458 |
Other |  | 572 |  |  | 1 |  |  | (7 | ) |  | 566 |
Residential-mortgage-backed securities |  | 1,404 |  |  | — |  |  | (22 | ) |  | 1,382 |
Other mortgage- and asset-backed securities |  | 478 |  |  | — |  |  | (11 | ) |  | 467 |
Money market mutual funds |  | 4,375 |  |  | — |  |  | — |  |  | 4,375 |
Other short-term interest-bearing securities |  | 6,428 |  |  | — |  |  | — |  |  | 6,428 |
Total interest-bearing securities |  | $ | 25,769 |  |  | $ | 10 |  |  | $ | (127 | ) |  | $ | 25,652 |
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 |  | March 31, 2019 |  | December 31, 2018
Cash and cash equivalents |  | $ | 6,709 |  |  | $ | 6,365 |
Marketable securities |  | 18,943 |  |  | 22,359 |
Total interest-bearing securities |  | $ | 25,652 |  |  | $ | 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 |  | March 31, 2019 |  | December 31, 2018
Maturing in one year or less |  | $ | 14,357 |  |  | $ | 17,424 |
Maturing after one year through three years |  | 4,600 |  |  | 3,356 |
Maturing after three years through five years |  | 3,987 |  |  | 5,168 |
Maturing after five years through ten years |  | 859 |  |  | 885 |
Mortgage- and asset-backed securities |  | 1,849 |  |  | 1,891 |
Total interest-bearing securities |  | $ | 25,652 |  |  | $ | 28,724 |
Available-for-sale securities, continuous unrealized loss position, fair value | 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 March 31, 2019 |  | Fair values |  | Unrealized losses |  | Fair values |  | Unrealized losses
U.S. Treasury notes |  | $ | 1,190 |  |  | $ | (11 | ) |  | $ | 1,452 |  |  | $ | (16 | )
Other government-related debt securities: |  |  |  |  |  |  |  |
U.S. |  | — |  |  | — |  |  | 111 |  |  | (1 | )
Foreign and other |  | 410 |  |  | (6 | ) |  | 307 |  |  | (4 | )
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 1,783 |  |  | (14 | ) |  | 822 |  |  | (8 | )
Industrial |  | 1,516 |  |  | (20 | ) |  | 634 |  |  | (7 | )
Other |  | 454 |  |  | (6 | ) |  | 36 |  |  | (1 | )
Residential-mortgage-backed securities |  | 558 |  |  | (9 | ) |  | 809 |  |  | (13 | )
Other mortgage- and asset-backed securities |  | 17 |  |  | — |  |  | 450 |  |  | (11 | )
Total |  | $ | 5,928 |  |  | $ | (66 | ) |  | $ | 4,621 |  |  | $ | (61 | )
|  | 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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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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