Summary of Significant Accounting Policies (Details) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) Years	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Net Income		$ 332	$ 283	$ 206	$ 83	$ 488	$ 255	$ 289	$ 262	$ 904	$ 1,294	$ 1,542
Advertising Expense										68	73	96
Operating Profit		482	471	300	250	546	480	471	433	1,503	1,930	2,296
Franchise advertising and other services expense										1,314	1,368	1,208
Future lease payments due from franchisees on a nominal basis		1,000								1,000
Reclassification of Retained Earnings to Common Stock for Share Repurchase										179	796	2,356
Employee stock option and SARs exercises (includes tax impact)										41	75	41
Revenues		1,743	1,448	1,198	1,263	1,694	1,339	1,310	1,254	5,652	5,597	5,688
Accumulated Deficit		(7,480)				(7,628)				$ (7,480)	(7,628)
Number of consecutive years of operating losses used as primary indicator of potential impairment for our semi-annual impairment testing of restaurant assets | Years										2
Retained Earnings
Schedule of Equity Method Investments [Line Items]
Net Income										$ 904	1,294	1,542
Employee stock option and SARs exercises (includes tax impact)											18
Accounting Standards Update 2016-02 [Member]
Schedule of Equity Method Investments [Line Items]
Accumulated Deficit						(2)					(2)
Advertising Cooperatives [Domain]
Schedule of Equity Method Investments [Line Items]
Advertising Expense										10	10	35
Franchise advertising and other services expense										1,079	1,133	1,035
Company Sales
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		566	486	403	355	490	364	359	333	1,810	1,546	2,000
Franchise contributions for advertising and other services
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 427	$ 323	$ 270	$ 312	$ 434	$ 330	$ 318	$ 309	1,332	1,391	1,206
United States | Company Sales
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										1,309	1,014
United States | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										1,050	1,059
United States | Franchise contributions for advertising and other services
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										818	811
CHINA | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										255	274
Other, Outside the U.S. and China [Member] | Company Sales
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										501	532
Other, Outside the U.S. and China [Member] | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										1,080	1,185
Other, Outside the U.S. and China [Member] | Franchise contributions for advertising and other services
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										514	580
KFC Global Division [Member]
Schedule of Equity Method Investments [Line Items]
Operating Profit										922	1,052	959
Revenues	[1]									2,272	2,491	2,644
KFC Global Division [Member] | United States | Company Sales
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										60	74
KFC Global Division [Member] | United States | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										184	175
KFC Global Division [Member] | United States | Franchise contributions for advertising and other services
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										18	10
KFC Global Division [Member] | CHINA | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										204	214
KFC Global Division [Member] | Other, Outside the U.S. and China [Member] | Company Sales
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										446	497
KFC Global Division [Member] | Other, Outside the U.S. and China [Member] | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										833	912
KFC Global Division [Member] | Other, Outside the U.S. and China [Member] | Franchise contributions for advertising and other services
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										453	520
Pizza Hut Global Division [Member]
Schedule of Equity Method Investments [Line Items]
Operating Profit										335	369	348
Revenues	[1]									1,002	1,027	988
Pizza Hut Global Division [Member] | United States | Company Sales
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										21	21
Pizza Hut Global Division [Member] | United States | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										272	282
Pizza Hut Global Division [Member] | United States | Franchise contributions for advertising and other services
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										317	318
Pizza Hut Global Division [Member] | CHINA | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										51	60
Pizza Hut Global Division [Member] | Other, Outside the U.S. and China [Member] | Company Sales
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										55	33
Pizza Hut Global Division [Member] | Other, Outside the U.S. and China [Member] | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										222	246
Pizza Hut Global Division [Member] | Other, Outside the U.S. and China [Member] | Franchise contributions for advertising and other services
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										57	58
Taco Bell Global Division [Member]
Schedule of Equity Method Investments [Line Items]
Operating Profit										696	683	633
Revenues	[1]									2,031	2,079	2,056
Taco Bell Global Division [Member] | United States | Company Sales
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										882	919
Taco Bell Global Division [Member] | United States | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										593	602
Taco Bell Global Division [Member] | United States | Franchise contributions for advertising and other services
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										483	483
Taco Bell Global Division [Member] | CHINA | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										0	0
Taco Bell Global Division [Member] | Other, Outside the U.S. and China [Member] | Company Sales
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										0	2
Taco Bell Global Division [Member] | Other, Outside the U.S. and China [Member] | Franchise [Member]
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										25	27
Taco Bell Global Division [Member] | Other, Outside the U.S. and China [Member] | Franchise contributions for advertising and other services
Schedule of Equity Method Investments [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										4	2
Franchise and property expenses [Member]
Schedule of Equity Method Investments [Line Items]
Sales Allowances, Services										$ 12	24	$ 11
53rd Week Impact [Member]
Schedule of Equity Method Investments [Line Items]
Net Income											17
Operating Profit											24
Revenues											$ 66

[1] U.S. revenues included in the combined KFC, Pizza Hut, Taco Bell and Habit Burger Grill Divisions totaled $3.2 billion in 2020, $3.0 billion in 2019 and $2.9 billion in 2018.