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Investments - Schedule of Investments by Major Security Type (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Short-term investments |  |
Debt securities, amortized cost | $ 3,060 |
Debt securities, total estimated fair value | 3,049 |
Total short-term investments | 3,747 | $ 3,197
Long-term investments |  |
Debt securities, amortized cost | 3,060 |
Debt securities, total estimated fair value | 3,049 |
Short-term investments |  |
Short-term investments |  |
Debt securities, amortized cost | 3,047 | 2,508
Debt securities, gross unrealized gains | 5 | 6
Debt securities, gross unrealized losses | (7) | (7)
Debt securities, total estimated fair value | 3,045 | 2,507
Time deposits | 702 | 690
Amortized Cost | 3,749 | 3,198
Total short-term investments | 3,747 | 3,197
Long-term investments |  |
Debt securities, amortized cost | 3,047 | 2,508
Debt securities, gross unrealized gains | 5 | 6
Debt securities, gross unrealized losses | (7) | (7)
Debt securities, total estimated fair value | 3,045 | 2,507
Short-term investments | Corporate debt securities |  |
Short-term investments |  |
Debt securities, amortized cost | 2,176 | 1,490
Debt securities, gross unrealized gains | 4 | 4
Debt securities, gross unrealized losses | (3) | (3)
Debt securities, total estimated fair value | 2,177 | 1,491
Long-term investments |  |
Debt securities, amortized cost | 2,176 | 1,490
Debt securities, gross unrealized gains | 4 | 4
Debt securities, gross unrealized losses | (3) | (3)
Debt securities, total estimated fair value | 2,177 | 1,491
Short-term investments | Commercial paper |  |
Short-term investments |  |
Debt securities, amortized cost | 214 | 366
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 214 | 366
Long-term investments |  |
Debt securities, amortized cost | 214 | 366
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 214 | 366
Short-term investments | Government bonds |  |
Short-term investments |  |
Debt securities, amortized cost | 224 | 332
Debt securities, gross unrealized gains | 0 | 1
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 224 | 333
Long-term investments |  |
Debt securities, amortized cost | 224 | 332
Debt securities, gross unrealized gains | 0 | 1
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 224 | 333
Short-term investments | Certificates of deposit |  |
Short-term investments |  |
Debt securities, amortized cost | 52 | 172
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 52 | 172
Long-term investments |  |
Debt securities, amortized cost | 52 | 172
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 52 | 172
Short-term investments | Mortgage-backed and asset-backed securities |  |
Short-term investments |  |
Debt securities, amortized cost | 381 | 148
Debt securities, gross unrealized gains | 1 | 1
Debt securities, gross unrealized losses | (4) | (4)
Debt securities, total estimated fair value | 378 | 145
Long-term investments |  |
Debt securities, amortized cost | 381 | 148
Debt securities, gross unrealized gains | 1 | 1
Debt securities, gross unrealized losses | (4) | (4)
Debt securities, total estimated fair value | 378 | 145
Long-term investments | Corporate debt securities |  |
Short-term investments |  |
Debt securities, amortized cost | 13 | 13
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | (9) | (9)
Debt securities, total estimated fair value | 4 | 4
Long-term investments |  |
Debt securities, amortized cost | 13 | 13
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | (9) | (9)
Debt securities, total estimated fair value | $ 4 | $ 4

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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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