Geographical Information - Summary of Revenue by Geographic Area (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Entity Wide Revenue Major Customer [Line Items]
Revenue	$ 2,541	$ 1,901	$ 1,728
Core Marketplace Revenue
Entity Wide Revenue Major Customer [Line Items]
Revenue	1,827	1,473	1,508
Net gains from cash flow hedging program	7
Core Marketplace Revenue | United States
Entity Wide Revenue Major Customer [Line Items]
Revenue	$ 614	$ 472	$ 495