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Investments and Fair Value Measurement - Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financial Assets
Non-marketable equity securities	$ 279	$ 6,576
Recurring
Financial Assets
Non-marketable debt securities:	4,089	3,817
Non-marketable equity securities	6,404	52
Marketable equity securities	1,386	0
Note receivable from a related party	81	83
Total financial assets	16,174	6,338
Financial Liabilities
Total financial liabilities	230	0
Recurring | Call Option
Financial Liabilities
MLU B.V. Call Option	230	0
Recurring | Money market funds
Financial Assets
Cash and cash equivalents	4,214	2,386
Recurring | Commercial paper
Financial Assets
Non-marketable debt securities:	0	611
Recurring | U.S. government and agency securities
Financial Assets
Non-marketable debt securities:	0	542
Recurring | Corporate bonds
Financial Assets
Non-marketable debt securities:	0	323
Recurring | Non-marketable debt securities
Financial Assets
Non-marketable debt securities:	4,089	2,341
Recurring | Level 1
Financial Assets
Non-marketable equity securities	0	0
Marketable equity securities	1,386	0
Note receivable from a related party	0	0
Total financial assets	5,600	2,386
Financial Liabilities
Total financial liabilities	0	0
Recurring | Level 1 | Call Option
Financial Liabilities
MLU B.V. Call Option	0	0
Recurring | Level 1 | Money market funds
Financial Assets
Cash and cash equivalents	4,214	2,386
Recurring | Level 1 | Commercial paper
Financial Assets
Non-marketable debt securities:	0	0
Recurring | Level 1 | U.S. government and agency securities
Financial Assets
Non-marketable debt securities:	0	0
Recurring | Level 1 | Corporate bonds
Financial Assets
Non-marketable debt securities:	0	0
Recurring | Level 1 | Non-marketable debt securities
Financial Assets
Non-marketable debt securities:	0	0
Recurring | Level 2
Financial Assets
Non-marketable equity securities	4,126	0
Marketable equity securities	0	0
Note receivable from a related party	0	0
Total financial assets	4,126	1,476
Financial Liabilities
Total financial liabilities	0	0
Recurring | Level 2 | Call Option
Financial Liabilities
MLU B.V. Call Option	0	0
Recurring | Level 2 | Money market funds
Financial Assets
Cash and cash equivalents	0	0
Recurring | Level 2 | Commercial paper
Financial Assets
Non-marketable debt securities:	0	611
Recurring | Level 2 | U.S. government and agency securities
Financial Assets
Non-marketable debt securities:	0	542
Recurring | Level 2 | Corporate bonds
Financial Assets
Non-marketable debt securities:	0	323
Recurring | Level 2 | Non-marketable debt securities
Financial Assets
Non-marketable debt securities:	0	0
Recurring | Level 3
Financial Assets
Non-marketable equity securities	2,278	52
Marketable equity securities	0	0
Note receivable from a related party	81	83
Total financial assets	6,448	2,476
Financial Liabilities
Total financial liabilities	230	0
Recurring | Level 3 | Call Option
Financial Liabilities
MLU B.V. Call Option	230	0
Recurring | Level 3 | Money market funds
Financial Assets
Cash and cash equivalents	0	0
Recurring | Level 3 | Commercial paper
Financial Assets
Non-marketable debt securities:	0	0
Recurring | Level 3 | U.S. government and agency securities
Financial Assets
Non-marketable debt securities:	0	0
Recurring | Level 3 | Corporate bonds
Financial Assets
Non-marketable debt securities:	0	0
Recurring | Level 3 | Non-marketable debt securities
Financial Assets
Non-marketable debt securities:	$ 4,089	$ 2,341

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