Shareholders' Equity Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 04, 2015	Sep. 28, 2014	Oct. 04, 2015	Sep. 28, 2014	Dec. 31, 2014	Jun. 04, 2015	Feb. 09, 2015
Class of Stock [Line Items]
Stock Repurchased During Period, Shares			19.3		29.0
Stock Repurchased During Period, Value			$ 2,700		$ 3,400
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						10.0	10.0
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	3.1		3.1
Stock Repurchase Program, Authorized Shares Remaining for Repurchase, Percentage Of Total Shares Outstanding	1.00%		1.00%
Recognized net actuarial loss (before tax)			$ 334	$ 228
Amortization of prior service credit (before tax)			$ 54	$ 51
Common Stock, Dividends, Per Share, Declared	$ 0.69	$ 0.62	$ 2.07	$ 1.86
Dividends paid in cash	$ 223	$ 207	$ 655	$ 618