Other Financial Data - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period			$ (952)
Total other comprehensive income (loss), net of tax	$ 65	$ (43)	118	$ (22)
Balance at end of period	(976)		(976)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period			(2,317)
Total other comprehensive income (loss), net of tax			118
Balance at end of period	(2,199)	(1,888)	(2,199)	(1,888)
Foreign Currency Translation Adjustments:
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(460)	(253)	(494)	(266)
Other comprehensive income (loss) before reclassification adjustment	47	(98)	84	(84)
Tax expense	0	0	(3)	(1)
Total other comprehensive income (loss), net of tax	47	(98)	81	(85)
Balance at end of period	(413)	(351)	(413)	(351)
Available-for-Sale Securities:
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	0	1	0	(3)
Other comprehensive income (loss) before reclassification adjustment	7	(2)	7	(2)
Tax expense	(3)	1	(3)	1
Other comprehensive income (loss) before reclassification adjustment, net of tax	4	(1)	4	(1)
Reclassification adjustment before tax	0	0	0	6
Tax expense (benefit)	0	0	0	(2)
Reclassification adjustment after tax	0	0	0	4
Total other comprehensive income (loss), net of tax	4	(1)	4	3
Balance at end of period	4	0	4	0
Defined Benefit Plans:
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(1,804)	(1,593)	(1,823)	(1,597)
Other comprehensive income (loss) before reclassification adjustment	(11)	53	(11)	53
Tax expense	0	(16)	0	(16)
Other comprehensive income (loss) before reclassification adjustment, net of tax	(11)	37	(11)	37
Tax expense (benefit)	(3)	8	(5)	8
Reclassification adjustment after tax	25	19	44	23
Total other comprehensive income (loss), net of tax	14	56	33	60
Balance at end of period	(1,790)	(1,537)	(1,790)	(1,537)
Reclassification adjustment - Actuarial net losses into Selling, general, and administrative expenses
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment before tax	16	18	32	28
Reclassification adjustment - Prior service benefits into Selling, general, and administrative expenses
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment before tax	(4)	(7)	(8)	(13)
Reclassification adjustment - Non-U.S. pension settlement loss into Other charges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification adjustment before tax	$ 16	$ 0	$ 25	$ 0