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Investments and Fair Value Measurement - Summary of Amortized Cost, Unrealized Gains and Losses of Financial Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,281	$ 2,281
Recurring
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,281	3,756
Unrealized Gains	1,808	61
Unrealized Losses	0	0
Fair Value	4,089	3,817
Recurring | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	611
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	0	611
Recurring | U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	542
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	0	542
Recurring | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	322
Unrealized Gains	0	1
Unrealized Losses	0	0
Fair Value	0	323
Recurring | Non-marketable debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,281	2,281
Unrealized Gains	1,808	60
Unrealized Losses	0	0
Fair Value	$ 4,089	$ 2,341

X

- Definition

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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