Pension, Retiree Medical and Savings Plans (Components of Benefit Expense) (Details) (USD $) In Millions, unless otherwise specified	4 Months Ended	12 Months Ended
	Dec. 29, 2012	Dec. 28, 2013 United States Pension Plan of US Entity, Defined Benefit		Dec. 29, 2012 United States Pension Plan of US Entity, Defined Benefit		Dec. 31, 2011 United States Pension Plan of US Entity, Defined Benefit		Dec. 28, 2013 International		Dec. 29, 2012 International		Dec. 31, 2011 International		Dec. 28, 2013 Retiree Medical Plan		Dec. 29, 2012 Retiree Medical Plan		Dec. 31, 2011 Retiree Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Pre-tax non-cash settlement charge	$ 195
Service cost		467		407		350		111		100		95		45		50		51
Interest cost		527		534		547		118		115		117		54		65		88
Expected return on plan assets		(823)		(796)		(704)		(157)		(146)		(136)		(27)		(22)		(14)
Amortization of prior service cost/(credit)		18		17		14		1		1		2		(23)		(26)		(28)
Amortization of net loss		289		259		145		66		53		40		1				12
Gross total		478		421		352		139		123		118		50		67		109
Settlement/curtailment (gain)/loss(a)		(4)	[1]	185	[1]	(8)	[1]	7	[1]	4	[1]	30	[1]		[1]		[1]		[1]
Special termination benefits		22		8		71				1		1		2		5		1
Total		$ 496		$ 614		$ 415		$ 146		$ 128		$ 149		$ 52		$ 72		$ 110

[1] U.S. includes pension lump sum settlement charge of $195 million in 2012. This charge is reflected in items affecting comparability (see additional unaudited information in “Items Affecting Comparability” in Management’s Discussion and Analysis of Financial Condition and Results of Operations).