Shareholders' Equity Shareholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Apr. 05, 2015	Mar. 30, 2014	Dec. 31, 2014	Feb. 09, 2015
Class of Stock [Line Items]
Stock Repurchased During Period, Shares	4.7	14.0	29.0
Stock Repurchased During Period, Value	$ 634		$ 3,400
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				10
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	7.7
Stock Repurchase Program, Authorized Shares Remaining for Repurchase, Percentage Of Total Shares Outstanding	2.00%
Recognized net actuarial loss (before tax)	112	76
Amortization of prior service credit (before tax)	(18)	(17)
Common Stock, Dividends, Per Share, Declared	$ 0.69	$ 0.62
Dividends paid in cash	$ 206	$ 198