Accumulated Other Comprehensive Loss and Other Comprehensive Income - Before and after-tax components of other comprehensive income (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Pension and postretirement benefits adjustments, pre-tax:
Amortization of net actuarial loss, pre-tax	$ 34	$ 26
Amortization of prior service cost (credit), pre-tax	2	(2)
Unrealized gains, pre-tax		7
Pension and postretirement benefits adjustments, net, pre-tax	36	31
Deferred gains on hedge contracts, pre-tax:
Current deferrals, pre-tax	3	22
Reclassification adjustments, pre-tax	2	7
Deferred gains on hedge contracts, net, pre-tax	5	29
Foreign currency translation adjustments, pre-tax	21	25
Other comprehensive income (loss), pre-tax	62	85
Pension and postretirement benefits adjustments, tax:
Amortization of net actuarial loss, tax	(12)	(9)
Amortization of prior service cost (credit), tax		1
Unrealized gains, tax		(2)
Pension and postretirement benefits adjustments, net, tax	(12)	(10)
Deferred gains on hedge contracts, tax:
Current deferrals, tax	(1)	(6)
Reclassification adjustments, tax		(2)
Deferred gains on hedge contracts, net, tax	(1)	(8)
Foreign currency translation adjustments, tax	1	(1)
Other comprehensive income (loss), tax	(12)	(19)
Pension and postretirement benefits adjustments, after-tax:
Amortization of net actuarial loss, after-tax	22	17
Amortization of prior service cost (credit), after-tax	2	(1)
Unrealized gains, after-tax		5
Pension and postretirement benefits adjustments, net, after-tax	24	21
Deferred gains on hedge contracts, after-tax:
Current deferrals, after-tax	2	16
Reclassification adjustments, after-tax	2	5
Deferred gains on hedge contracts, net, after-tax	4	21
Foreign currency translation adjustments, after-tax	22	24
Other comprehensive income	$ 50	$ 66