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AVAILABLE-FOR-SALE DEBT SECURITIES | 9 Months Ended
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Sep. 30, 2021
Debt Securities, Available-for-sale [Abstract] |
AVAILABLE-FOR-SALE DEBT SECURITIES | AVAILABLE-FOR-SALE DEBT SECURITIES 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 |
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 |
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 |
We held a total of 214 and 208 positions which were in unrealized loss positions as of September 30, 2021 and 2020, respectively. The unrealized losses were largely due to changes in interest rates. Aggregated gross unrealized losses on available-for-sale debt securities were not material for the three and nine months ended September 30, 2021 and 2020. No impairment was recognized for the three and nine months ended September 30, 2021 and 2020.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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