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Investments (Tables) | 3 Months Ended
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Mar. 31, 2020
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, 2020 |  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair values
U.S. Treasury notes |  | $ | 173 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 176 |
U.S. Treasury bills |  | 900 |  |  | — |  |  | — |  |  | 900 |
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 12 |  |  | — |  |  | — |  |  | 12 |
Industrial |  | 12 |  |  | — |  |  | — |  |  | 12 |
Other |  | — |  |  | — |  |  | — |  |  | — |
Residential-mortgage-backed securities |  | — |  |  | — |  |  | — |  |  | — |
Money market mutual funds |  | 5,762 |  |  | — |  |  | — |  |  | 5,762 |
Other short-term interest-bearing securities |  | 432 |  |  | — |  |  | — |  |  | 432 |
Total interest-bearing securities |  | $ | 7,291 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 7,294 |
Types of securities as of December 31, 2019 |  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair values
U.S. Treasury notes |  | $ | 359 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 360 |
U.S. Treasury bills |  | — |  |  | — |  |  | — |  |  | — |
Corporate debt securities: |  |  |  |  |  |  |  |
Financial |  | 1,108 |  |  | 13 |  |  | — |  |  | 1,121 |
Industrial |  | 824 |  |  | 10 |  |  | — |  |  | 834 |
Other |  | 195 |  |  | 3 |  |  | — |  |  | 198 |
Residential-mortgage-backed securities |  | 181 |  |  | 1 |  |  | — |  |  | 182 |
Money market mutual funds |  | 5,250 |  |  | — |  |  | — |  |  | 5,250 |
Other short-term interest-bearing securities |  | 289 |  |  | — |  |  | — |  |  | 289 |
Total interest-bearing securities |  | $ | 8,206 |  |  | $ | 28 |  |  | $ | — |  |  | $ | 8,234 |
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, 2020 |  | December 31, 2019
Cash and cash equivalents |  | $ | 6,969 |  |  | $ | 5,360 |
Marketable securities |  | 325 |  |  | 2,874 |
Total interest-bearing securities |  | $ | 7,294 |  |  | $ | 8,234 |
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 residential-mortgage-backed securities that do not have a single maturity date, were as follows (in millions):
Contractual maturities |  | March 31, 2020 |  | December 31, 2019
Maturing in one year or less |  | $ | 7,165 |  |  | $ | 5,629 |
Maturing after one year through three years |  | 129 |  |  | 2,304 |
Maturing after three years through five years |  | — |  |  | 119 |
Residential mortgage-backed securities |  | — |  |  | 182 |
Total interest-bearing securities |  | $ | 7,294 |  |  | $ | 8,234 |

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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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