Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended								12 Months Ended
	Jan. 01, 2018	Dec. 22, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 23, 2016	Jun. 24, 2016	Mar. 25, 2016	Dec. 31, 2017	Dec. 30, 2016	Dec. 25, 2015
Selected Quarterly Financial Information [Abstract]
Revenue			$ 2,863	$ 2,743	$ 2,933	$ 2,869	$ 3,037	$ 2,710	$ 2,704	$ 2,618	$ 11,408	$ 11,069	$ 11,811
Operating Income			1,121	876	958	712	1,004	841	840	704	3,667	3,389	3,584
Net Earnings			$ 4,140	$ 459	$ 510	$ 362	$ 458	$ 455	$ 445	$ 356	$ 5,471	$ 1,714	$ 1,968
Earnings Per Share, Basic (in dollars per share)			$ 4.63	$ 0.51	$ 0.55	$ 0.39	$ 0.49	$ 0.48	$ 0.47	$ 0.37	$ 6.01	$ 1.81	$ 2.00
Earnings Per Share, Assuming Dilution (in dollars per share)			$ 4.62	$ 0.51	$ 0.55	$ 0.39	$ 0.49	$ 0.48	$ 0.47	$ 0.37	$ 5.99	$ 1.81	$ 2.00
Effect of change in enacted tax rate			$ 3,600								$ (3,506)	$ 0	$ 0
Effect of change in tax rate (in dollars per share)		$ 3.81	$ 3.91
U.S. corporate tax rate (as a percent)											35.00%
Subsequent Event
Selected Quarterly Financial Information [Abstract]
U.S. corporate tax rate (as a percent)	21.00%