Quarterly Results (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014		Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information [Line Items]
Sales by Company-operated restaurants	$ 4,296.7	$ 4,596.2		$ 4,785.9	$ 4,490.5	$ 4,744.3	$ 4,923.1		$ 4,761.4	$ 4,445.4	$ 18,169.3	$ 18,874.2	$ 18,602.5
Revenues from franchised restaurants	2,275.5	2,390.9		2,395.8	2,209.8	2,348.9	2,400.3		2,322.4	2,159.9	9,272.0	9,231.5	8,964.5
Total revenues	6,572.2	6,987.1		7,181.7	6,700.3	7,093.2	7,323.4		7,083.8	6,605.3	27,441.3	28,105.7	27,567.0
Total operating income	1,751.7	2,072.5		2,189.0	1,936.0	2,200.4	2,416.7		2,197.7	1,949.5	7,949.2	8,764.3	8,604.6
Net income	1,097.5	1,068.4		1,387.1	1,204.8	1,397.0	1,522.2		1,396.5	1,270.2	4,757.8	5,585.9	5,464.8
Earnings per common share–basic	$ 1.14	$ 1.09		$ 1.40	$ 1.22	$ 1.41	$ 1.53		$ 1.39	$ 1.27	$ 4.85	$ 5.59	$ 5.41
Earnings per common share–diluted	$ 1.13	$ 1.09		$ 1.40	$ 1.21	$ 1.40	$ 1.52		$ 1.38	$ 1.26	$ 4.82	$ 5.55	$ 5.36
Dividends declared per common share		$ 1.66	[1]	$ 0.81	$ 0.81		$ 1.58	[2]	$ 0.77	$ 0.77	$ 3.28	$ 3.12	$ 2.87
Weighted-averaged common shares–basic	966.6	978.7		987.4	989.6	992.5	997.3		1,001.4	1,002.7	980.5	998.4	1,010.1
Weighted-averaged common shares–diluted	971.5	983.8		993.2	995.9	999.3	1,004.2		1,008.7	1,010.8	986.3	1,006.0	1,020.2
Common stock sales price per share, Quarter end	$ 93.70	$ 94.81		$ 100.74	$ 98.03	$ 97.03	$ 96.21		$ 99.00	$ 99.69	$ 93.70	$ 97.03
Company-operated
Quarterly Financial Information [Line Items]
Margin	620.0	721.5		816.1	723.4	815.6	918.7		841.9	719.4
Franchised
Quarterly Financial Information [Line Items]
Margin	$ 1,854.1	$ 1,959.7		$ 1,968.2	$ 1,792.7	$ 1,927.2	$ 1,991.9		$ 1,923.3	$ 1,764.7
Maximum
Quarterly Financial Information [Line Items]
Common stock sales price per share	$ 97.50	$ 101.36		$ 103.78	$ 99.07	$ 99.27	$ 101.81		$ 103.70	$ 99.78
Minimum
Quarterly Financial Information [Line Items]
Common stock sales price per share	$ 87.62	$ 90.53		$ 96.52	$ 92.22	$ 93.14	$ 94.01		$ 95.16	$ 89.25

[1] Includes a $0.81 per share dividend declared and paid in third quarter and a $0.85 per share dividend declared in third quarter and paid in fourth quarter.

[2] Includes a $0.77 per share dividend declared and paid in third quarter and a $0.81 per share dividend declared in third quarter and paid in fourth quarter.