Quarterly Information (Summary Of Quarterly Results Of Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 24, 2011	Jun. 25, 2011	Mar. 26, 2011	Dec. 25, 2010	Sep. 25, 2010	Jun. 26, 2010	Mar. 27, 2010	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Quarterly Information [Abstract]
Revenues	$ 7,295,350	$ 6,425,379	$ 6,621,633	$ 6,836,402	$ 6,431,482	$ 6,086,076	$ 6,261,831	$ 6,548,665	$ 27,178,764	$ 25,328,054	$ 24,514,960
Costs and expenses	6,721,351	5,978,544	6,079,262	6,264,682	5,942,548	5,676,395	5,762,828	6,024,959	25,043,839	23,406,730	22,834,047
Net earnings	$ 399,528	$ 311,902	$ 382,369	$ 398,167	$ 342,102	$ 283,222	$ 348,424	$ 364,399	$ 1,491,966	$ 1,338,147	$ 1,161,442
Basic and diluted earnings per share	$ 0.51	$ 0.40	$ 0.48	$ 0.51	$ 0.44	$ 0.36	$ 0.44	$ 0.47	$ 1.90	$ 1.70	$ 1.47