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Investments (Tables) | 6 Months Ended
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Jun. 30, 2022
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 June 30, 2022 |  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair values
U.S. Treasury notes |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
U.S. Treasury bills |  | 1,980 |  |  | — |  |  | — |  |  | 1,980 |
Money market mutual funds |  | 4,433 |  |  | — |  |  | — |  |  | 4,433 |
Other short-term interest-bearing securities |  | — |  |  | — |  |  | — |  |  | — |
Total interest-bearing securities |  | $ | 6,413 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,413 |
Types of securities as of December 31, 2021 |  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair values
U.S. Treasury notes |  | $ | 47 |  |  | $ | — |  |  | $ | — |  |  | $ | 47 |
U.S. Treasury bills |  | 1,400 |  |  | — |  |  | — |  |  | 1,400 |
Money market mutual funds |  | 5,856 |  |  | — |  |  | — |  |  | 5,856 |
Other short-term interest-bearing securities |  | 1 |  |  | — |  |  | — |  |  | 1 |
Total interest-bearing securities |  | $ | 7,304 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,304 |
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 |  | June 30, 2022 |  | December 31, 2021
Cash and cash equivalents |  | $ | 4,433 |  |  | $ | 7,256 |
Marketable securities |  | 1,980 |  |  | 48 |
Total interest-bearing securities |  | $ | 6,413 |  |  | $ | 7,304 |

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- Definition Tabular disclosure of fair values of available-for-sale investments by classification in the consolidated balance sheets. + References No definition available. + Details
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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 https://asc.fasb.org/topic&trid=2196928 + Details
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