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Items Affecting Comparability of Net Income - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2018
Operating profit	$ 342		$ 97
Impairment of long lived asset	3		$ 12
Fujian Sunner Development Co., Ltd. [Member]
Percentage of equity interest acquired			5.00%
Total consideration paid to acquire interest			$ 261
Unrealized investment gain (loss)			(17)
Meituan Dianping [Member]
Unrealized investment gain (loss)	1		(8)
Number of ordinary shares subscribed				8.4
Maximum percentage of ordinary shares subscribed				1.00%
Fair value of Investment in Meituan's ordinary shares				$ 74
Number of ordinary shares sold		4.2
Proceeds from disposal of equity security		$ 54
Pre-tax gain from disposal of equity security		$ 17
COVID-19 [Member]
Operating profit	$ 342		97
COVID-19 [Member] \| Restaurant-level impairment [Member]
Impairment of long lived asset			$ 9