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Investments - Available-For-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investments |  |
Estimated Fair Value | $ 2,794 |
Short-term investments: |  |
Investments |  |
Gross Amortized Cost | 1,262 | $ 4,198
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 1,261 | 4,199
Short-term investments: | Restricted cash |  |
Investments |  |
Gross Amortized Cost | 26 | 22
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 26 | 22
Short-term investments: | Corporate debt securities |  |
Investments |  |
Gross Amortized Cost | 1,196 | 4,151
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 1,195 | 4,152
Short-term investments: | Government and agency securities |  |
Investments |  |
Gross Amortized Cost | 40 | 25
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 40 | 25
Long-term investments: |  |
Investments |  |
Gross Amortized Cost | 1,609 | 1,733
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (76) | (7)
Estimated Fair Value | 1,533 | 1,727
Long-term investments: | Restricted cash |  |
Investments |  |
Gross Amortized Cost | 4 | 0
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 4 |
Long-term investments: | Corporate debt securities |  |
Investments |  |
Gross Amortized Cost | 807 | 954
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (40) | (5)
Estimated Fair Value | 767 | 950
Long-term investments: | Government and agency securities |  |
Investments |  |
Gross Amortized Cost | 798 | 779
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (36) | (2)
Estimated Fair Value | $ 762 | $ 777

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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