Shareholders' Equity - Before and after-tax components of other comprehensive income (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Pension and postretirement benefits adjustments, pre-tax:
Unrealized gains (losses), pre-tax	$ 18	$ (382)	$ 136
Amortization of net actuarial loss, pre-tax	136	104	150
Amortization of prior service cost (credit), pre-tax	7	(7)	(7)
Recognition of prior service credit (cost), pre-tax	(1)	12
Pension and postretirement benefits adjustments, net, pre-tax	160	(273)	279
Deferred gains (losses) on hedge contracts, pre-tax:
Current deferrals, pre-tax	10	11	(33)
Reclassification adjustments, pre-tax	7	17	19
Deferred gains (losses) on hedge contracts, net, pre-tax	17	28	(14)
Foreign currency translation adjustments, pre-tax	100	(36)	(55)
Other comprehensive income (loss), pre-tax	277	(281)	210
Pension and postretirement benefits adjustments, tax:
Unrealized gains (losses), tax	(1)	135	(44)
Amortization of net actuarial loss, tax	(48)	(39)	(53)
Amortization of prior service cost (credit), tax	(2)	4	2
Recognition of prior service credit (cost), tax		(5)
Pension and postretirement benefits adjustments, net, tax	(51)	95	(95)
Deferred gains (losses) on hedge contracts, tax:
Current deferrals, tax	(2)	(4)	7
Reclassification adjustments, tax	(1)	(4)	(4)
Deferred gains (losses) on hedge contracts, net, tax	(3)	(8)	3
Foreign currency translation adjustments, tax	7	(13)	(10)
Other comprehensive income (loss), tax	(47)	74	(102)
Pension and postretirement benefits adjustments, after-tax:
Unrealized gains (losses), after-tax	17	(247)	92
Amortization of net actuarial loss, after-tax	88	65	97
Amortization of prior service cost (credit), after-tax	5	(3)	(5)
Recognition of prior service credit (cost), after-tax	(1)	7
Pension and postretirement benefits adjustments, net, after-tax	109	(178)	184
Deferred gains (losses) on hedge contracts, after-tax:
Current deferrals, after-tax	8	7	(26)
Reclassification adjustments, after-tax	6	13	15
Deferred gains (losses) on hedge contracts, net, after-tax	14	20	(11)
Foreign currency translation adjustments, after-tax	107	(49)	(65)
Other comprehensive income (loss)	$ 230	$ (207)	$ 108

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