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AVAILABLE-FOR-SALE DEBT SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2021
Debt Securities, Available-for-sale [Abstract] |
Reconciliation of Available-for-Sale Debt Securities from Cost Basis to Fair Value | The following table summarizes our available-for-sale debt securities:
|  | September 30, 2021 |  | December 31, 2020
(in millions) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
U.S. treasury securities |  | $ | 360 |  |  | $ | — |  |  | $ | — |  |  | $ | 360 |  |  | $ | 308 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 309 |
U.S. government agencies securities |  | 5 |  |  | — |  |  | — |  |  | 5 |  |  | — |  |  | — |  |  | — |  |  | — |
Non-U.S. government securities |  | 44 |  |  | — |  |  | — |  |  | 44 |  |  | 43 |  |  | — |  |  | — |  |  | 43 |
Certificates of deposit |  | 361 |  |  | — |  |  | — |  |  | 361 |  |  | 216 |  |  | — |  |  | — |  |  | 216 |
Corporate debt securities |  | 1,272 |  |  | 1 |  |  | (1) |  |  | 1,272 |  |  | 1,140 |  |  | 2 |  |  | — |  |  | 1,142 |
Residential mortgage and asset-backed securities |  | 447 |  |  | — |  |  | — |  |  | 447 |  |  | 316 |  |  | — |  |  | — |  |  | 316 |
Total |  | $ | 2,489 |  |  | $ | 1 |  |  | $ | (1) |  |  | $ | 2,489 |  |  | $ | 2,023 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 2,026 |
Summary of Classification of Available-for-Sale Debt Securities | The following table summarizes the classification of our available-for-sale debt securities in our Condensed Consolidated Balance Sheets:
(in millions) |  | September 30, 2021 |  | December 31, 2020
Cash and cash equivalents |  | $ | 14 |  |  | $ | 113 |
Short-term marketable securities |  | 1,376 |  |  | 1,411 |
Long-term marketable securities |  | 1,099 |  |  | 502 |
Total |  | $ | 2,489 |  |  | $ | 2,026 |
Summary of Available-for-Sale Debt Securities by Contractual Maturity | The following table summarizes our available-for-sale debt securities by contractual maturity:
|  | September 30, 2021
(in millions) |  | Amortized Cost |  | Fair Value
Within one year |  | $ | 1,390 |  |  | $ | 1,390 |
After one year through five years |  | 1,075 |  |  | 1,075 |
After five years |  | 24 |  |  | 24 |
Total |  | $ | 2,489 |  |  | $ | 2,489 |

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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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