Gross Amount and Related Tax Benefit/(Expense) Recorded in and Associated with each Component of Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Foreign Currency Translation Adjustments
OCI Before Reclassifications
Before Tax Amount	$ (410)	$ (142)	$ (272)	$ (796)
Tax	0	0	0	0
Net of Tax Amount	(410)	(142)	(272)	(796)
Net investment hedge adjustments
OCI Before Reclassifications
Before Tax Amount	199	16	193	206
Tax	(48)	(3)	(46)	(48)
Net of Tax Amount	151	13	147	158
Amounts Excluded from Effectiveness Assessment
Before Tax Amount	8	7	21	7
Tax	(2)	(4)	(5)	(4)
Net of Tax Amount	6	3	16	3
Reclassifications
Before Tax Amount	(8)	(6)	(15)	(6)
Tax	2	4	5	4
Net of Tax Amount	(6)	(2)	(10)	(2)
Net cash flow hedge adjustments
OCI Before Reclassifications
Before Tax Amount	51	(17)	20	46
Tax	(1)	1	4	(6)
Net of Tax Amount	50	(16)	24	40
Amounts Excluded from Effectiveness Assessment
Before Tax Amount	8	0	22	0
Tax	0	0	(1)	0
Net of Tax Amount	8	0	21	0
Reclassifications
Before Tax Amount	(50)	11	(61)	(9)
Tax	0	1	6	(1)
Net of Tax Amount	(50)	12	(55)	(10)
Amortization of unrecognized losses/(gains)
OCI Before Reclassifications
Before Tax Amount	(13)	22	(14)	93
Tax	4	(5)	0	(23)
Net of Tax Amount	(9)	17	(14)	70
Net Postemployment Benefit Plan Adjustments
OCI Before Reclassifications
Net of Tax Amount			(14)
Reclassifications
Before Tax Amount	(79)	(77)	(235)	(177)
Tax	20	19	59	44
Net of Tax Amount	$ (59)	$ (58)	$ (176)	$ (133)