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Investments - Unrealized Gains and Losses and Estimated Fair Value of Investments Classified as Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Investments
Estimated Fair Value	$ 3,248
Short-term investments	30
Short-term investments:
Investments
Gross Amortized Cost	1,793	$ 3,462
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(3)	(6)
Estimated Fair Value	1,790	3,457
Short-term investments: | Corporate debt securities
Investments
Gross Amortized Cost	1,540	3,095
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value	1,539	3,094
Short-term investments: | Government and agency securities
Investments
Gross Amortized Cost	253	367
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	(4)
Estimated Fair Value	251	363
Long-term investments:
Investments
Gross Amortized Cost	1,454	1,311
Gross Unrealized Gains	8	4
Gross Unrealized Losses	(4)	(6)
Estimated Fair Value	1,458	1,309
Long-term investments: | Corporate debt securities
Investments
Gross Amortized Cost	1,310	1,117
Gross Unrealized Gains	8	4
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value	1,317	1,119
Long-term investments: | Government and agency securities
Investments
Gross Amortized Cost	144	194
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3)	(4)
Estimated Fair Value	$ 141	$ 190

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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).

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