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Investments - Schedule of Investments by Major Security Type (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
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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