Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	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
Numerator:
Net Earnings	$ 4,140	$ 459	$ 510	$ 362	$ 458	$ 455	$ 445	$ 356	$ 5,471	$ 1,714	$ 1,968
Dividend Equivalents on Restricted Stock									(1)	(1)	(1)
Net Earnings, Attributable to Common Shareholders									$ 5,470	$ 1,713	$ 1,967
Denominator:
Average Common Shares Outstanding (in shares)									911	947	983
Other Potentially Dilutive Common Shares (in shares)									3	1	1
Average Common Shares Outstanding, Assuming Dilution (in shares)									914	948	984
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
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