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Business Combinations - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions				1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 11, 2021	Dec. 01, 2020	Jan. 02, 2020	Aug. 31, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Convertible notes settled							$ 427,000,000
Convertible notes settled in cash							195,000,000
Convertible notes settled in equity							232,000,000
Common stock issued in connection with acquisitions							967,000,000	$ 96,000,000
Goodwill purchase period adjustment							181,000,000
CS Mexico
Business Acquisition [Line Items]
Ownership interest (percent)	55.00%
CS-Global | CS Mexico
Business Acquisition [Line Items]
Ownership interest (percent)	100.00%
Careem Inc.
Business Acquisition [Line Items]
Consideration transferred			$ 3,000,000,000
Convertible notes			$ 1,600,000,000
Term of convertible notes (in days)			90 days
Commitment to issue unsecured convertible notes in connection with Careem acquisition							115,000,000
Commitment to issue unsecured convertible notes in connection with Careem acquisition							$ 122,000,000
Careem Inc. | The Careem Notes | Convertible notes
Business Acquisition [Line Items]
Conversion price (in dollars per share)			$ 55
Careem Inc. | The Careem Notes | Convertible notes
Business Acquisition [Line Items]
Aggregate principal amount			$ 880,000,000
CS-Global
Business Acquisition [Line Items]
Consideration transferred				$ 967,000,000
Interest acquired (in percent)				45.00%		55.00%		55.00%
Period after closing date (in years)						5 years
Percentage of voting interests acquired, diluted basis				0.47
Shares issued for acquisition				25.0
CS-Global | Equity Option
Business Acquisition [Line Items]
Shares issued for acquisition				4.0
CS-Global | Restricted Stock
Business Acquisition [Line Items]
Shares issued for acquisition				4.6
Common stock issued in connection with acquisitions				$ 202,000,000
Award requisite service period (in years)				3 years
Award vesting period (in years)				3 years
CS Mexico
Business Acquisition [Line Items]
Interest acquired (in percent)					55.00%
CS Mexico | CS-Global
Business Acquisition [Line Items]
Voting interest to be acquired contingent on regulatory approval (percent)									100.00%
Postmates Inc.
Business Acquisition [Line Items]
Consideration transferred		$ 3,900,000,000
Interest acquired (in percent)		100.00%
Goodwill purchase period adjustment					$ 170,000,000
Accrued and other liability, purchase accounting adjustments					$ 170,000,000

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