Other Income (Expense), Net - Summary of Other Income (Expense), Net (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income And Expenses [Abstract]
Foreign currency exchange rates gains (losses), net	[1]	$ 5	$ (2)	$ (9)
Earnings (losses) from equity method investment, net		(3)	(1)
Gain (loss) and impairments on minority equity investments, net				1
Loss on sale/disposal of business	[2]	(6)
Other, net		(4)		3
Total		$ (8)	$ (3)	$ (5)

[1] Our foreign currency exchange gains (losses), net, are generally related to foreign exchange transaction gains and losses from the conversion of the transaction currency to the functional currency, partially offset by the forward contract gains and losses.

[2] Primarily related to loss on disposal on the sale of our SmarterTravel business in June 2020