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Investments - Schedule of Investments by Major Security Type (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Short-term investments |  |
Debt securities, amortized cost | $ 2,324 |
Debt securities, total estimated fair value | 2,300 |
Total short-term investments | 2,787 | $ 2,244
Long-term investments: |  |
Debt securities, amortized cost | 2,324 |
Debt securities, total estimated fair value | 2,300 |
Short-term investments |  |
Short-term investments |  |
Debt securities, amortized cost | 2,311 | 2,232
Debt securities, gross unrealized gains | 1 | 1
Debt securities, gross unrealized losses | (16) | (10)
Debt securities, total estimated fair value | 2,296 | 2,223
Time deposits | 490 | 20
Equity investments | 1 | 1
Amortized Cost | 2,802 | 2,253
Total short-term investments | 2,787 | 2,244
Long-term investments: |  |
Debt securities, amortized cost | 2,311 | 2,232
Debt securities, gross unrealized gains | 1 | 1
Debt securities, gross unrealized losses | (16) | (10)
Debt securities, total estimated fair value | 2,296 | 2,223
Short-term investments | Certificates of deposit |  |
Short-term investments |  |
Debt securities, amortized cost | 328 | 573
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 328 | 573
Long-term investments: |  |
Debt securities, amortized cost | 328 | 573
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 328 | 573
Short-term investments | Government bonds |  |
Short-term investments |  |
Debt securities, amortized cost | 291 | 83
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 291 | 83
Long-term investments: |  |
Debt securities, amortized cost | 291 | 83
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 291 | 83
Short-term investments | Commercial paper |  |
Short-term investments |  |
Debt securities, amortized cost | 366 | 574
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 366 | 574
Long-term investments: |  |
Debt securities, amortized cost | 366 | 574
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | 0 | 0
Debt securities, total estimated fair value | 366 | 574
Short-term investments | Corporate debt securities |  |
Short-term investments |  |
Debt securities, amortized cost | 1,209 | 965
Debt securities, gross unrealized gains | 1 | 1
Debt securities, gross unrealized losses | (10) | (7)
Debt securities, total estimated fair value | 1,200 | 959
Long-term investments: |  |
Debt securities, amortized cost | 1,209 | 965
Debt securities, gross unrealized gains | 1 | 1
Debt securities, gross unrealized losses | (10) | (7)
Debt securities, total estimated fair value | 1,200 | 959
Short-term investments | Mortgage-backed and asset-backed securities |  |
Short-term investments |  |
Debt securities, amortized cost | 117 | 37
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | (6) | (3)
Debt securities, total estimated fair value | 111 | 34
Long-term investments: |  |
Debt securities, amortized cost | 117 | 37
Debt securities, gross unrealized gains | 0 | 0
Debt securities, gross unrealized losses | (6) | (3)
Debt securities, total estimated fair value | 111 | 34
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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