Items Affecting Comparability of Net Income and Cash Flows (Details) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
		Sep. 30, 2020 USD ($)	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2018 USD ($) shares	Dec. 31, 2020 USD ($) restaurants	Dec. 31, 2019 USD ($) restaurants	Dec. 31, 2018 USD ($) restaurants	Dec. 31, 2017 USD ($)	Jun. 24, 2020 USD ($)
Facility Actions [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount								$ (35)	$ (434)
General and administrative expenses						$ 1,064	$ 917	895
Investment (income) expense, net	[1]					74	(67)	9
Deferred income taxes						65	232	11
Refranchising (gain) loss						34	37	540
Proceeds from Sale, Maturity and Collection of Investments						206
Noncash or Part Noncash Divestiture, Amount of Consideration Received	[2]					31	6	0
Charitable Contribution, Authorized Spend										$ 100
Proceeds from Divestiture of Businesses, Including Noncash Consideration						$ 19	$ 110	$ 825
Statutory rate differential attributable to foreign operations (in hundredths)						(0.90%)	0.90%	(4.60%)
Payments for (Proceeds from) Investments						$ 206	$ 0	$ (200)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent						(2.50%)	0.00%	(1.90%)
Subsidiary Senior Unsecured Notes [Member] | Unsecured Debt [Member]
Facility Actions [Line Items]
Repayments of Debt, Maturing in More than Three Months						$ 1,050
Interest rate, stated (in hundredths)						5.00%
Gain (Loss) on Extinguishment of Debt						$ 26
Write off of Deferred Debt Issuance Cost						$ 6
Foreign [Member]
Facility Actions [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent		19.00%	17.00%	17.00%		19.00%
Gain (loss) on disposition of assets [Member]
Facility Actions [Line Items]
Number of Restaurants Refranchised | restaurants						97	25	660
General and Administrative Expense [Member]
Facility Actions [Line Items]
Costs Associated with Resource Optimization Initiative						$ 36
Other pension (income) expense [Member]
Facility Actions [Line Items]
Costs Associated with Resource Optimization Initiative						2
Corporate and Other [Member]
Facility Actions [Line Items]
General and administrative expenses	[1],[3]					(312)	$ (188)	$ (171)
KFC Global Division [Member]
Facility Actions [Line Items]
Refranchising (gain) loss						33	6	240
Pizza Hut Global Division [Member]
Facility Actions [Line Items]
Refranchising (gain) loss						(1)	0	(13)
Taco Bell Global Division [Member]
Facility Actions [Line Items]
Refranchising (gain) loss						2	31	313
Interest Expense [Member] | Subsidiary Senior Unsecured Notes [Member] | Unsecured Debt [Member]
Facility Actions [Line Items]
Gain (Loss) on Extinguishment of Debt						2
GrubHub Inc. [Member]
Facility Actions [Line Items]
Investment (income) expense, net						69	(77)	$ 14
Investment Owned, Balance, Shares | shares					2.8
Payments for (Proceeds from) Investments					$ 200
Intra-Entity IP Transfers [Member]
Facility Actions [Line Items]
Deferred income taxes		$ 25				3	$ 226
2018 [Member]
Facility Actions [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount						$ 35

[1] Amounts have not been allocated to any segment for performance reporting purposes.

[2] In 2020 we received as refranchising consideration a minority interest in an entity that operates KFC and Pizza Hut franchised units in India and in 2019 we received as refranchising consideration a minority interest in an entity that owns our KFC Brazil and Pizza Hut Brazil master franchisee rights, respectively (See Note 5).

[3] Amounts in 2020 include charitable contributions to Yum! Brands Foundation, Inc. of $50 million and $25 million related to our Unlocking Opportunity Initiative and COVID-19 employee relief, respectively. Additionally, 2020 includes $36 million for charges associated with resource optimization (See Note 5) and $9 million in costs associated with our acquisition and integration of Habit Burger Grill (See Note 3).