Supplemental Financial Statement Information - Other Long-Term Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Deferred tax liabilities	$ 793	$ 1,027
Commitment to issue unsecured convertible notes in connection with Careem acquisition	298	0
Financing obligation	78	78
Income tax liabilities	80	70
Other	249	237
Other long-term liabilities	1,498	$ 1,412
Careem Inc.
Business Acquisition [Line Items]
Commitment to issue unsecured convertible notes in connection with Careem acquisition	$ 298

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