Shareholders' Equity - Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Equity [Abstract]
Gain (loss) on cash flow hedges, gross amount	$ 12	$ 7	$ 0	$ (34)
Gain (loss) on cash flow hedges, benefit (provision) for income tax	(3)	(3)	1	4
Gain (loss) on cash flow hedges, net amount	9	4	1	(30)
Unrealized gains on securities, gross amount	0	5	7	7
Unrealized gains on securities, benefit (provision) for income tax	0	(2)	(2)	(2)
Unrealized gains on securities, net amount	0	3	5	5
Foreign currency translation adjustments, gross amount	152	129	(92)	91
Foreign currency translation adjustments, benefit (provision) for income tax	(2)	(27)	1	(28)
Foreign currency translation adjustments,net amount	150	102	(91)	63
Change in retirement plans' funded status, gross amount	95	56	299	177
Change in retirement plans' funded status, benefit (provision) for income tax	(34)	(20)	(108)	(60)
Change in retirement plans' funded status, net amount	61	36	191	117
Other comprehensive income (loss), gross amount	259	197	214	241
Other comprehensive income (loss), benefit (provision) for income tax	(39)	(52)	(108)	(86)
Other comprehensive income (loss), net amount	$ 220	$ 145	$ 106	$ 155