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Investments and Fair Value Measurement - Narrative (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) boardSeat	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Marketable Securities [Line Items]
Proceeds from sale of non-marketable equity securities				$ 500,000,000	$ 0
Upward adjustments	$ 0		$ 0	71,000,000	$ 0
Allowance for credit loss	0			0		$ 0
Grab
Marketable Securities [Line Items]
Included in other comprehensive income (loss)	497,000,000			1,700,000,000
Aurora
Marketable Securities [Line Items]
Unrealized gain on investments	102,000,000			$ 573,000,000
Number of investee board seats held | boardSeat				1
Didi
Marketable Securities [Line Items]
Proceeds from sale of non-marketable equity securities		$ 500,000,000
Upward adjustments		$ 71,000,000
Unrealized gain on investments	(3,200,000,000)			$ (1,700,000,000)
Zomato
Marketable Securities [Line Items]
Unrealized gain on investments	994,000,000			994,000,000
Equity securities	$ 1,100,000,000			$ 1,100,000,000
Common Stock Equivalent | Aurora | Relative weighting
Marketable Securities [Line Items]
Measurement input	0.50			0.50
Option Pricing Model | Aurora
Marketable Securities [Line Items]
Time to liquidity (in years)				4 years 3 months
Option Pricing Model | Aurora | Volatility
Marketable Securities [Line Items]
Measurement input	0.66			0.66
Option Pricing Model | Aurora | Relative weighting
Marketable Securities [Line Items]
Measurement input	0.50			0.50

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