Shareholders' Equity - Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Equity [Abstract]
Gain (loss) on cash flow hedges, gross amount	$ 0	$ (55)	$ (12)	$ (41)
Gain (loss) on cash flow hedges, benefit (provision) for income tax	0	14	4	7
Gain (loss) on cash flow hedges, net amount	0	(41)	(8)	(34)
Unrealized gains on securities, gross amount	3	(3)	7	2
Unrealized gains on securities, benefit (provision) for income tax	0	1	(2)	0
Unrealized gains on securities, net amount	3	(2)	5	2
Foreign currency translation adjustments, gross amount	(66)	(207)	(244)	(38)
Foreign currency translation adjustments, benefit (provision) for income tax	1	16	3	(1)
Foreign currency translation adjustments,net amount	(65)	(191)	(241)	(39)
Change in retirement plans' funded status, gross amount	104	64	204	121
Change in retirement plans' funded status, benefit (provision) for income tax	(37)	(20)	(74)	(40)
Change in retirement plans' funded status, net amount	67	44	130	81
Other comprehensive income (loss), gross amount	41	(201)	(45)	44
Other comprehensive income (loss), benefit (provision) for income tax	(36)	11	(69)	(34)
Other comprehensive income (loss), net amount	$ 5	$ (190)	$ (114)	$ 10