Commitments and Contingencies (Details) $ in Millions					1 Months Ended	12 Months Ended
	May 15, 2019 plaintiff	Mar. 26, 2019 USD ($)	Mar. 11, 2019 USD ($)	Sep. 25, 2018 plaintiff	May 31, 2017 indictment	Dec. 31, 2016 lawsuit	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 06, 2017 TWD ($)	Jan. 05, 2017 TWD ($)
Commitments and Contingencies Disclosure [Abstract]
Loss contingency accrual							$ 1,200	$ 1,100
Loss Contingencies [Line Items]
Taiwan, maximum fine per offense									$ 25,000,000	$ 150,000
O'Conner, et al., v. Uber Technologies, Inc. and Yucesoy v. Uber Technologies, Inc., et al.
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff				2
O'Conner, et al., v. Uber Technologies, Inc. and Yucesoy v. Uber Technologies, Inc., et al. | Settled Litigation
Loss Contingencies [Line Items]
Settlement amount awarded to other party			$ 20
Google v. Levandowski
Loss Contingencies [Line Items]
Settlement amount awarded to other party		$ 127
Joint and Several Liability
Loss Contingencies [Line Items]
Settlement amount awarded to other party		$ 1
Copenhagen Criminal Prosecution
Loss Contingencies [Line Items]
Number of indictments | indictment					4
Malden Transportion v. Uber Technologies, Inc.
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit						7
Malden Transportion v. Uber Technologies, Inc. | Subsequent Event
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff	6