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Investments and Fair Value Measurement - Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2021
Financial Assets
Non-marketable equity securities	$ 2,574	$ 2,111
Call Option
Financial Liabilities
MLU B.V. Call Option			$ 230
Recurring
Financial Assets
Non-marketable equity securities	0	3
Marketable equity securities	3,401	2,177
Notes receivable from a related party	126	110
Total financial assets	10,400	5,361
Financial Liabilities
Total financial liabilities	0	2
Recurring \| Call Option
Financial Liabilities
MLU B.V. Call Option	0	2
Recurring \| Level 1
Financial Assets
Non-marketable equity securities	0	0
Marketable equity securities	3,401	2,177
Notes receivable from a related party	0	0
Total financial assets	4,554	3,182
Financial Liabilities
Total financial liabilities	0	0
Recurring \| Level 1 \| Call Option
Financial Liabilities
MLU B.V. Call Option	0	0
Recurring \| Level 2
Financial Assets
Non-marketable equity securities	0	0
Marketable equity securities	0	0
Notes receivable from a related party	0	0
Total financial assets	5,720	2,066
Financial Liabilities
Total financial liabilities	0	0
Recurring \| Level 2 \| Call Option
Financial Liabilities
MLU B.V. Call Option	0	0
Recurring \| Level 3
Financial Assets
Non-marketable equity securities	0	3
Marketable equity securities	0	0
Notes receivable from a related party	126	110
Total financial assets	126	113
Financial Liabilities
Total financial liabilities	0	2
Recurring \| Level 3 \| Call Option
Financial Liabilities
MLU B.V. Call Option	0	2
Recurring \| Money market funds
Financial Assets
Cash and cash equivalents	1,153	1,005
Recurring \| Money market funds \| Level 1
Financial Assets
Cash and cash equivalents	1,153	1,005
Recurring \| Money market funds \| Level 2
Financial Assets
Cash and cash equivalents	0	0
Recurring \| Money market funds \| Level 3
Financial Assets
Cash and cash equivalents	0	0
Recurring \| U.S. government and agency securities
Financial Assets
Non-marketable debt securities	4,840	1,975
Recurring \| U.S. government and agency securities \| Level 1
Financial Assets
Non-marketable debt securities	0	0
Recurring \| U.S. government and agency securities \| Level 2
Financial Assets
Non-marketable debt securities	4,840	1,975
Recurring \| U.S. government and agency securities \| Level 3
Financial Assets
Non-marketable debt securities	0	0
Recurring \| Commercial paper
Financial Assets
Non-marketable debt securities	351	76
Recurring \| Commercial paper \| Level 1
Financial Assets
Non-marketable debt securities	0	0
Recurring \| Commercial paper \| Level 2
Financial Assets
Non-marketable debt securities	351	76
Recurring \| Commercial paper \| Level 3
Financial Assets
Non-marketable debt securities	0	0
Recurring \| Corporate bonds
Financial Assets
Non-marketable debt securities	263	15
Recurring \| Corporate bonds \| Level 1
Financial Assets
Non-marketable debt securities	0	0
Recurring \| Corporate bonds \| Level 2
Financial Assets
Non-marketable debt securities	263	15
Recurring \| Corporate bonds \| Level 3
Financial Assets
Non-marketable debt securities	0	0
Recurring \| Certificates of deposit
Financial Assets
Non-marketable debt securities	266	0
Recurring \| Certificates of deposit \| Level 1
Financial Assets
Non-marketable debt securities	0	0
Recurring \| Certificates of deposit \| Level 2
Financial Assets
Non-marketable debt securities	266	0
Recurring \| Certificates of deposit \| Level 3
Financial Assets
Non-marketable debt securities	$ 0	$ 0