Investments and Fair Value Measurement - Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2025	Dec. 31, 2024
Financial Assets
Debt securities	$ 10,634	$ 8,562
Non-marketable equity securities	4,413	3,199
Financial Liabilities
2028 Exchangeable Senior Notes	12,900	9,500
Assets transferred into (out of) Level 3	0
Liabilities transferred into (out of) Level 3	0
U.S. government and agency securities
Financial Assets
Debt securities	7,095	5,848
Commercial paper
Financial Assets
Debt securities	1,409	702
Corporate bonds
Financial Assets
Debt securities	2,067	1,974
Asset-backed securities
Financial Assets
Debt securities	13	0
Certificates of deposit
Financial Assets
Debt securities	50	38
Recurring
Financial Assets
Non-marketable equity securities	29	11
Marketable equity securities	5,737	5,106
Note receivable from a related party	151	144
Total financial assets	18,197	15,691
Financial Liabilities
Total financial liabilities	1,221	0
Recurring \| Senior Note \| 2028 Exchangeable Senior Notes
Financial Liabilities
2028 Exchangeable Senior Notes	1,221	0
Recurring \| Money market funds
Financial Assets
Cash and cash equivalents	1,646	1,868
Recurring \| U.S. government and agency securities
Financial Assets
Debt securities	7,095	5,848
Recurring \| Commercial paper
Financial Assets
Debt securities	1,409	702
Recurring \| Corporate bonds
Financial Assets
Debt securities	2,067	1,974
Recurring \| Asset-backed securities
Financial Assets
Debt securities	13	0
Recurring \| Certificates of deposit
Financial Assets
Debt securities	50	38
Recurring \| Level 1
Financial Assets
Non-marketable equity securities	0	0
Marketable equity securities	5,737	5,106
Note receivable from a related party	0	0
Total financial assets	7,383	6,974
Financial Liabilities
Total financial liabilities	0	0
Recurring \| Level 1 \| Senior Note \| 2028 Exchangeable Senior Notes
Financial Liabilities
2028 Exchangeable Senior Notes	0	0
Recurring \| Level 1 \| Money market funds
Financial Assets
Cash and cash equivalents	1,646	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 \| Asset-backed securities
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	10,634	8,562
Financial Liabilities
Total financial liabilities	1,221	0
Recurring \| Level 2 \| Senior Note \| 2028 Exchangeable Senior Notes
Financial Liabilities
2028 Exchangeable Senior Notes	1,221	0
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	7,095	5,848
Recurring \| Level 2 \| Commercial paper
Financial Assets
Debt securities	1,409	702
Recurring \| Level 2 \| Corporate bonds
Financial Assets
Debt securities	2,067	1,974
Recurring \| Level 2 \| Asset-backed securities
Financial Assets
Debt securities	13	0
Recurring \| Level 2 \| Certificates of deposit
Financial Assets
Debt securities	50	38
Recurring \| Level 3
Financial Assets
Non-marketable equity securities	29	11
Marketable equity securities	0	0
Note receivable from a related party	151	144
Total financial assets	180	155
Financial Liabilities
Total financial liabilities	0	0
Recurring \| Level 3 \| Senior Note \| 2028 Exchangeable Senior Notes
Financial Liabilities
2028 Exchangeable Senior Notes	0	0
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 \| Asset-backed securities
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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