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Investments - Available-For-Sale Securities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investments |  |
Estimated Fair Value | $ 2,764 |
Short-term investments: |  |
Investments |  |
Gross Amortized Cost | 1,757 | $ 2,552
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (14) | (19)
Estimated Fair Value | 1,743 | 2,533
Short-term investments: | Corporate debt securities |  |
Investments |  |
Gross Amortized Cost | 1,276 | 2,170
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6) | (8)
Estimated Fair Value | 1,270 | 2,162
Short-term investments: | Government and agency securities |  |
Investments |  |
Gross Amortized Cost | 481 | 382
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (8) | (11)
Estimated Fair Value | 473 | 371
Long-term investments: |  |
Investments |  |
Gross Amortized Cost | 1,044 | 625
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (23) | (26)
Estimated Fair Value | 1,021 | 599
Long-term investments: | Corporate debt securities |  |
Investments |  |
Gross Amortized Cost | 582 | 338
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (7) | (10)
Estimated Fair Value | 575 | 328
Long-term investments: | Government and agency securities |  |
Investments |  |
Gross Amortized Cost | 462 | 287
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (16) | (16)
Estimated Fair Value | $ 446 | $ 271

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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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 -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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