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Available-for-Sale Debt Securities | 12 Months Ended
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Dec. 31, 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:
|  | December 31, 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 |  | $ | 408 |  |  | $ | — |  |  | $ | (1) |  |  | $ | 407 |  |  | $ | 308 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 309 |
U.S. government agencies securities |  | 4 |  |  | — |  |  | — |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | — |
Non-U.S. government securities |  | 50 |  |  | — |  |  | — |  |  | 50 |  |  | 43 |  |  | — |  |  | — |  |  | 43 |
Certificates of deposit |  | 249 |  |  | — |  |  | — |  |  | 249 |  |  | 216 |  |  | — |  |  | — |  |  | 216 |
Corporate debt securities |  | 1,365 |  |  | — |  |  | (2) |  |  | 1,363 |  |  | 1,140 |  |  | 2 |  |  | — |  |  | 1,142 |
Residential mortgage and asset-backed securities |  | 425 |  |  | — |  |  | (1) |  |  | 424 |  |  | 316 |  |  | — |  |  | — |  |  | 316 |
Total |  | $ | 2,501 |  |  | $ | — |  |  | $ | (4) |  |  | $ | 2,497 |  |  | $ | 2,023 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 2,026 |
The following table summarizes the classification of our available-for-sale debt securities in our Consolidated Balance Sheets:
(in millions) |  | December 31, 2021 |  | December 31, 2020
Cash and cash equivalents |  | $ | 6 |  |  | $ | 113 |
Short-term marketable debt securities |  | 1,182 |  |  | 1,411 |
Long-term marketable debt securities |  | 1,309 |  |  | 502 |
Total |  | $ | 2,497 |  |  | $ | 2,026 |
The following table summarizes our available-for-sale debt securities by contractual maturity:
|  | December 31, 2021
(in millions) |  | Amortized Cost |  | Fair Value
Within one year |  | $ | 1,189 |  |  | $ | 1,188 |
After one year through five years |  | 1,288 |  |  | 1,286 |
After five years |  | 24 |  |  | 23 |
Total |  | $ | 2,501 |  |  | $ | 2,497 |
We held a total of 534 and 75 positions which were in unrealized loss positions as of December 31, 2021 and 2020, respectively. Aggregated gross unrealized losses on available-for-sale debt securities were not material for the years ended December 31, 2021 and 2020. No impairment was recognized for the years ended December 31, 2021, 2020 and 2019.

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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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