Shareholders' Equity - Before and after-tax components of other comprehensive income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Pension and postretirement benefits adjustments, pre-tax:
Amortization of net actuarial loss, pre-tax	$ 38	$ 34	$ 115	$ 102
Amortization of prior service cost, pre-tax	2	2	6	6
Business disposition, pre-tax	7		7
Pension and postretirement benefits adjustments, net, pre-tax	47	36	128	108
Deferred gains (losses) on hedge contracts, pre-tax:
Current deferrals, pre-tax	3	9	1	14
Reclassification adjustments, pre-tax	(2)	3	(3)	9
Deferred gains (losses) on hedge contracts, net, pre-tax	1	12	(2)	23
Foreign currency translation adjustments, pre-tax:
Foreign currency translation adjustments, pre-tax	1	31	(25)	91
Business disposition, pre-tax	6		6
Foreign currency translation adjustments, net, pre-tax	7	31	(19)	91
Other comprehensive income (loss), pre-tax	55	79	107	222
Pension and postretirement benefits adjustments, tax:
Amortization of net actuarial loss, tax	(9)	(12)	(27)	(36)
Amortization of prior service cost, tax		(1)	(1)	(2)
Pension and postretirement benefits adjustments, net, tax	(9)	(13)	(28)	(38)
Deferred gains (losses) on hedge contracts, tax:
Current deferrals, tax	(1)	(2)	(1)	(4)
Reclassification adjustments, tax	1		1	(1)
Deferred gains (losses) on hedge contracts, net, tax		(2)		(5)
Foreign currency translation adjustments, tax:
Foreign currency translation adjustments, tax		3	(1)	7
Foreign currency translation adjustments, net, tax		3	(1)	7
Other comprehensive income (loss), tax	(9)	(12)	(29)	(36)
Pension and postretirement benefits adjustments, after-tax:
Amortization of net actuarial loss, after-tax	29	22	88	66
Amortization of prior service cost, after-tax	2	1	5	4
Business disposition, after-tax	7		7
Pension and postretirement benefits adjustments, net, after-tax	38	23	100	70
Deferred gains (losses) on hedge contracts, after-tax:
Current deferrals, after-tax	2	7		10
Reclassification adjustments, after-tax	(1)	3	(2)	8
Deferred gains (losses) on hedge contracts, net, after-tax	1	10	(2)	18
Foreign currency translation adjustments, after-tax:
Foreign currency translation adjustments, after-tax	1	34	(26)	98
Business disposition, after-tax	6		6
Foreign currency translation adjustments, net, after-tax	7	34	(20)	98
Other comprehensive income	$ 46	$ 67	$ 78	$ 186

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