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Acquisitions, Other Investments and Divestitures - Summary of Fair Value of Assets Acquired and Liabilities Assumed in Conjunction with Acquisition (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 7,380	$ 8,127	$ 8,120
Travel Related Companies
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill			31
Intangible assets with definite lives			24
Deferred tax liabilities, net			(1)
Total			$ 54