Accumulated Other Comprehensive Loss and Other Comprehensive Income - Before and after-tax components of other comprehensive income (loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Pension and postretirement benefits adjustments, pre-tax:
Amortization of net actuarial loss, pre-tax	$ 26	$ 39	$ 52	$ 78
Amortization of prior service credit, pre-tax	(2)		(4)	(2)
Unrealized gains, pre-tax		98	7	98
Pension and postretirement benefits adjustments, net, pre-tax	24	137	55	174
Deferred gains (losses) on hedge contracts, pre-tax:
Current deferrals, pre-tax	(2)	3	20	(18)
Reclassification adjustments, pre-tax	8	3	15	9
Deferred gains (losses) on hedge contracts, net, pre-tax	6	6	35	(9)
Foreign currency translation adjustments, pre-tax	(14)	9	11	(43)
Other comprehensive income (loss), pre-tax	16	152	101	122
Pension and postretirement benefits adjustments, tax:
Amortization of net actuarial loss, tax	(10)	(14)	(19)	(28)
Amortization of prior service credit, tax	1		2	1
Unrealized gains, tax		(36)	(2)	(36)
Pension and postretirement benefits adjustments, net, tax	(9)	(50)	(19)	(63)
Deferred gains (losses) on hedge contracts, tax:
Current deferrals, tax		(1)	(6)	4
Reclassification adjustments, tax	(2)	(1)	(4)	(3)
Deferred gains (losses) on hedge contracts, net, tax	(2)	(2)	(10)	1
Foreign currency translation adjustments, tax	(6)	1	(7)	(3)
Other comprehensive income (loss), tax	(17)	(51)	(36)	(65)
Pension and postretirement benefits adjustments, after-tax:
Amortization of net actuarial loss, after-tax	16	25	33	50
Amortization of prior service credit, after-tax	(1)		(2)	(1)
Unrealized gains, after-tax		62	5	62
Pension and postretirement benefits adjustments net, after-tax	15	87	36	111
Deferred gains (losses) on hedge contracts, after-tax:
Current deferrals, after-tax	(2)	2	14	(14)
Reclassification adjustments, after-tax	6	2	11	6
Deferred gains (losses) on hedge contracts, net, after-tax	4	4	25	(8)
Foreign currency translation adjustments, after-tax	(20)	10	4	(46)
Other comprehensive income (loss)	$ (1)	$ 101	$ 65	$ 57