Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on minority equity investments, net	$ (188,000,000)	$ 22,000,000
Net gains (losses) from foreign currency forward contracts	106,000,000	(6,000,000)
Impairment of goodwill	765,000,000	0
Goodwill	7,330,000,000		$ 8,127,000,000
Impairment of intangible assets	121,000,000	0
Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount of foreign currency derivatives	3,700,000,000
Net forward asset	79,000,000
Gross forward asset	131,000,000
Net forward liability			8,000,000
Gross forward liability			30,000,000
Nonrecurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of goodwill	765,000,000
Impairment of intangible assets	121,000,000
Carrying value of cost method investments	352,000,000		$ 467,000,000
Impairment losses related to a minority investment	113,000,000
Total cumulative adjustments made to the initial costs bases of investments	82,000,000
Nonrecurring Basis | Retail
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of goodwill	539,000,000
Goodwill	2,300,000,000
Nonrecurring Basis | trivago
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of goodwill	226,000,000
Goodwill	316,000,000
Despegar.com
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on minority equity investments, net	(75,000,000)	$ 24,000,000
Level 3 | Nonrecurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indefinite-lived intangible assets (excluding goodwill), fair value disclosure	$ 237,000,000