Investments and Fair Value Measurement - Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Financial Assets
Debt securities	$ 8,389	$ 8,562
Non-marketable equity securities	3,565	3,199
U.S. government and agency securities
Financial Assets
Debt securities	6,153	5,848
Commercial paper
Financial Assets
Debt securities	289	702
Corporate bonds
Financial Assets
Debt securities	1,901	1,974
Certificates of deposit
Financial Assets
Debt securities	46	38
Recurring
Financial Assets
Non-marketable equity securities	6	11
Marketable equity securities	5,031	5,106
Note receivable from a related party	144	144
Total financial assets	14,304	15,691
Recurring \| Money market funds
Financial Assets
Cash and cash equivalents	734	1,868
Recurring \| U.S. government and agency securities
Financial Assets
Debt securities	6,153	5,848
Recurring \| Commercial paper
Financial Assets
Debt securities	289	702
Recurring \| Corporate bonds
Financial Assets
Debt securities	1,901	1,974
Recurring \| Certificates of deposit
Financial Assets
Debt securities	46	38
Recurring \| Level 1
Financial Assets
Non-marketable equity securities	0	0
Marketable equity securities	5,031	5,106
Note receivable from a related party	0	0
Total financial assets	5,765	6,974
Recurring \| Level 1 \| Money market funds
Financial Assets
Cash and cash equivalents	734	1,868
Recurring \| Level 1 \| U.S. government and agency securities
Financial Assets
Debt securities	0	0
Recurring \| Level 1 \| Commercial paper
Financial Assets
Debt securities	0	0
Recurring \| Level 1 \| Corporate bonds
Financial Assets
Debt securities	0	0
Recurring \| Level 1 \| Certificates of deposit
Financial Assets
Debt securities	0	0
Recurring \| Level 2
Financial Assets
Non-marketable equity securities	0	0
Marketable equity securities	0	0
Note receivable from a related party	0	0
Total financial assets	8,389	8,562
Recurring \| Level 2 \| Money market funds
Financial Assets
Cash and cash equivalents	0	0
Recurring \| Level 2 \| U.S. government and agency securities
Financial Assets
Debt securities	6,153	5,848
Recurring \| Level 2 \| Commercial paper
Financial Assets
Debt securities	289	702
Recurring \| Level 2 \| Corporate bonds
Financial Assets
Debt securities	1,901	1,974
Recurring \| Level 2 \| Certificates of deposit
Financial Assets
Debt securities	46	38
Recurring \| Level 3
Financial Assets
Non-marketable equity securities	6	11
Marketable equity securities	0	0
Note receivable from a related party	144	144
Total financial assets	150	155
Recurring \| Level 3 \| Money market funds
Financial Assets
Cash and cash equivalents	0	0
Recurring \| Level 3 \| U.S. government and agency securities
Financial Assets
Debt securities	0	0
Recurring \| Level 3 \| Commercial paper
Financial Assets
Debt securities	0	0
Recurring \| Level 3 \| Corporate bonds
Financial Assets
Debt securities	0	0
Recurring \| Level 3 \| Certificates of deposit
Financial Assets
Debt securities	$ 0	$ 0

Fair value portion of asset recognized for present right to economic benefit.

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