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Investments - Estimated fair values of short and long-term investments classified by date of contractual maturity (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
One year or less (including restricted cash of $26) | $ 1,261 |
One year through two years (including restricted cash of $4) | 560 |
Two years through three years | 657 |
Three years through four years | 242 |
Four years through five years | 74 |
Estimated Fair Value | 2,794 |
Short-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Restricted cash | 1,262 | $ 4,198
Estimated Fair Value | 1,261 | 4,199
Short-term investments: | Restricted cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Restricted cash | 26 | 22
Estimated Fair Value | 26 | 22
Long-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Restricted cash | 1,609 | 1,733
Estimated Fair Value | 1,533 | 1,727
Long-term investments: | Restricted cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Restricted cash | 4 | $ 0
Estimated Fair Value | $ 4 |

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- Definition Amortized cost 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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