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Share-based and Deferred Compensation Plans (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) groups $ / shares Rate shares		Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	$ 97.0		$ 59.0	$ 50.0
Award Valuation
Risk-free interest rate (in hundredths)	1.00%		2.50%	2.50%
Expected term (years)	5 years 9 months 18 days		6 years 6 months	6 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	24.00%		22.00%	22.00%
Expected dividend yield (in hundredths)	1.90%		1.80%	1.80%
Number of homogeneous groups appropriate to group awards into when estimating expected term | groups	2
Summary of award activity - Stock options and SARs, additional disclosures [Abstract]
Options outstanding at the end of the year (in shares) | shares	601
SARs outstanding at the end of the year (in shares) | shares	14,960
Options outstanding at the end of the year, Weighted-average exercise price (in dollars per share) | $ / shares	$ 66.89
SARs outstanding at the end of the year, Weighted-average exercise price (in dollars per share) | $ / shares	$ 74.83
Impact on net income [Abstract]
Share-based Payment Arrangement, Expense, Tax Benefit	$ 18.0		$ 9.0	$ 9.0
EID compensation expense not share-based	9.0		17.0	(2.0)
Cash received from stock options exercises	10.0		1.0	6.0
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	58.0		66.0	60.0
General and administrative expenses	1,064.0		917.0	895.0
Stock Options and Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	$ 75.0		39.0	37.0
Minimum vesting period of outstanding awards (in years)	1.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 70.0		$ 31.0	$ 28.0
Summary of award activity - Stock options and SARs [Roll Forward]
Granted (in shares) | shares	4,358
Exercised (in shares) | shares	(3,137)
Forfeited or expired (in shares) | shares	(523)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price | $ / shares	$ 88.29
Summary of award activity - Stock options and SARs, additional disclosures [Abstract]
Granted, Weighted-average exercise price (in dollars per share) | $ / shares	101.42
Exercised, Weighted-average exercise price (in dollars per share) | $ / shares	$ 44.41
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 530.0
Exercisable at the end of the year (in shares) | shares	10,108
Exercisable at the end of the year, Weighted-average exercise price (in dollars per share) | $ / shares	$ 65.64
Share Based Compensation Arrangement By Share Based Payment Award, Options, Exercisable Weighted Average Remaining Contractual Term	5 years 5 months 4 days
Exercisable at the end of the year, Aggregate intrinsic value (in dollars)	$ 434.0
Options outstanding at the end of the year (in shares) | shares	15,562	[1]	14,864
Options outstanding at the end of the year, Weighted-average exercise price (in dollars per share) | $ / shares	$ 74.52		$ 60.76
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 4 months 20 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares	$ 18.83		$ 19.82	$ 16.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 170.0		$ 204.0	$ 195.0
Unrecognized compensation cost	50.0
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	2.0		8.0	7.0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	20.0		12.0	6.0
Restricted Stock Units And Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	15.0		$ 14.0	$ 16.0
Summary of award activity - Stock options and SARs, additional disclosures [Abstract]
Unrecognized compensation cost	$ 28.0
Unvested RSUs and PSUs | shares	1,000
Long Term Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum vesting period of outstanding awards (in years)	immediate
Maximum vesting period of outstanding awards (in years)	five
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Average Exercise Period	5 years
Approximate number of shares available for grant (in shares) | shares	24,000
Executive Income Deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Company match on amount deferred (in hundredths) | Rate	33.00%
Executive Income Deferral Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	2 years
Restaurant-level Employees [Domain] | Long Term Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Vesting period (in years)	4 years
Executives [Domain] | Long Term Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Average Exercise Period	6 years 6 months
Vesting period (in years)	4 years
Award Valuation
Graded vesting schedule of grants made to executives under other stock award plans	25%
Certain Executives [Domain] | Long Term Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
[1] Outstanding awards include 601 options and 14,960 SARs with weighted average exercise prices of $66.89 and $74.83, respectively. Outstanding awards represent YUM awards held by employees of both YUM and Yum China.

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