Summary of Significant Accounting Policies (Details 4) - USD ($) $ in Millions		3 Months Ended								12 Months Ended						18 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2018	Jan. 01, 2018
Reclassification of Retained Earnings to Common Stock for Share Repurchase										$ 796.0		$ 2,356.0		$ 1,915.0
Costs associated with PH U.S. Acceleration Agreement										25.0		25.0		39.0
Revenues		$ 1,694.0	$ 1,339.0	$ 1,310.0	$ 1,254.0	$ 1,558.0	$ 1,391.0	$ 1,368.0	$ 1,371.0	$ 5,597.0		5,688.0		5,878.0
Period Within Date Of Corresponding Sales In Which Trade Receivables Are Classified As Accounts And Notes Receivable										30 days
Receivables [Abstract]
Net amounts included in Other Assets		68.0				62.0				$ 68.0		62.0				$ 62.0
Allowance for doubtful accounts related to notes and direct financing lease receivables		1.0				1.0				1.0		1.0				1.0
Accounts and notes receivable [Abstract]
Accounts and notes receivable		656.0				592.0				656.0		592.0				592.0
Allowance for doubtful accounts		(72.0)				(31.0)				(72.0)		(31.0)				(31.0)
Accounts and notes receivable, net		584.0				561.0				584.0		561.0				561.0
Other Assets		431.0				321.0				431.0		321.0				321.0
Deferred income taxes		447.0				195.0				447.0		195.0				195.0
Other current liabilities		349.0				347.0				349.0		347.0				347.0
Repurchase Of Shares Of Common Stock [Abstract]
Stock Repurchased During Period, Value										(810.0)	[1]	(2,394.0)	[1]	(1,915.0)	[2]
Net Cash Provided by (Used in) Operating Activities										1,315.0		1,176.0		1,030.0
Cash, Cash Equivalents and Restricted Cash as presented in the Consolidated Statement of Cash Flows	[3]	$ 768.0				$ 474.0				768.0		474.0		1,599.0		474.0
Operating Expenses										3,667.0		3,392.0		3,117.0
Reduction to Retained earnings
Employee stock option and SARs exercises (includes tax impact)										18.0				20.0
Repurchase Of Shares Of Common Stock [Abstract]
Stock Repurchased During Period, Value										(796.0)		(2,356.0)		(1,915.0)
Accounting Standards Update 2014-09 [Member]
Accounts and notes receivable [Abstract]
Deferred income taxes																	$ 26.0
Franchise and property expenses [Member]
Repurchase Of Shares Of Common Stock [Abstract]
Sales Allowances, Services										24.0		11.0		5.0
Franchise advertising and other services expenses [Member] [Member]
Repurchase Of Shares Of Common Stock [Abstract]
Sales Allowances, Services										$ 19.0
Minimum [Member]
Continuing Fees Rate										4.00%
Maximum [Member]
Continuing Fees Rate										6.00%
Advertising [Member]
Repurchase Of Shares Of Common Stock [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax										$ 1,100.0
Capitalized software costs | Minimum [Member]
Finite-Lived Intangible Asset, Useful Life										3 years
Capitalized software costs | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life										7 years
Pizza Hut Global Division [Member]
Revenues	[4]									$ 1,027.0		988.0		893.0
Pizza Hut Global Division [Member] | Franchise and property expenses [Member]
Costs associated with PH U.S. Acceleration Agreement												12.5		25.0		$ 37.5
Pizza Hut Global Division [Member] | Incremental Advertising [Member] | Franchise and property expenses [Member]
Costs associated with PH U.S. Acceleration Agreement												$ 12.5		$ 25.0

[1] 2019 amount excludes and 2018 amount includes the effect of $5 million in share repurchases (0.1 million shares) with trade dates on, or prior to, December 31, 2018 but settlement dates subsequent to December 31, 2018.

[2] 2017 amount excludes the effect of $45 million in share repurchases (0.7 million shares) with trade dates prior to December 31, 2016 but settlement dates subsequent to December 31, 2016.

[3] Upon adoption of Topic 606 we reclassified cash of $11 million and restricted cash of $58 million, respectively, from Advertising cooperative assets, restricted to Cash and cash equivalents and Prepaid expenses and other current assets. These amounts are included in the Beginning of Year balance of Cash, Cash Equivalents, Restricted Cash and Restricted Cash equivalents in our Consolidated Statement of Cash Flows for the year ended December 31, 2018.

[4] U.S. revenues included in the combined KFC, Pizza Hut and Taco Bell Divisions totaled $3.0 billion in 2019, $2.9 billion in 2018 and $2.8 billion in 2017.