Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fiscal Period Adjustment [Line Items]
Refranchising (gain) loss									$ 34	$ 37	$ 540
Share-based Compensation Expense									97	59	50
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement									(4)	(3)
Revenues
Total revenues	$ 1,743	$ 1,448	$ 1,198	$ 1,263	$ 1,694	$ 1,339	$ 1,310	$ 1,254	5,652	5,597	5,688
Restaurant Profit	106	87	54	57	105	72	73	61	304	311
Operating Profit	482	471	300	250	546	480	471	433	1,503	1,930	2,296
Net Income	$ 332	$ 283	$ 206	$ 83	$ 488	$ 255	$ 289	$ 262	$ 904	$ 1,294	$ 1,542
Basic Earnings Per Common Share (in dollars per share)	$ 1.10	$ 0.94	$ 0.68	$ 0.28	$ 1.61	$ 0.83	$ 0.94	$ 0.85	$ 2.99	$ 4.23	$ 4.80
Diluted Earnings Per Common Share (in dollars per share)	1.08	0.92	0.67	0.27	1.58	0.81	0.92	0.83	2.94	4.14	4.69
Dividends Declared Per Common Share (in dollars per share)	$ 0.47	$ 0.47	$ 0.47	$ 0.47	$ 0.42	$ 0.42	$ 0.42	$ 0.42	$ 1.88	$ 1.68	$ 1.44
Company Sales
Revenues
Company sales	$ 566	$ 486	$ 403	$ 355	$ 490	$ 364	$ 359	$ 333	$ 1,810	$ 1,546	$ 2,000
Company Sales | United States
Revenues
Company sales									1,309	1,014
Franchise and property revenue [Member]
Revenues
Company sales	750	639	525	596	770	645	633	612	2,510	2,660	2,482
Franchise contributions for advertising and other services
Revenues
Company sales	$ 427	$ 323	$ 270	$ 312	$ 434	$ 330	$ 318	$ 309	1,332	1,391	$ 1,206
Franchise contributions for advertising and other services | United States
Revenues
Company sales									$ 818	$ 811