Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives - Restructuring Accruals (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Restructuring Reserve [Roll Forward]
Balance, December 31, 2017	[1]			$ 1,105
Credits	[2]	$ (24)	$ (23)	(33)	$ (27)
Utilization and other	[3]			(195)
Balance, July 1, 2018	[4]	877		877
Employee Termination Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2017	[1]			1,039
Credits				(29)
Utilization and other	[3]			(171)
Balance, July 1, 2018	[4]	839		839
Asset Impairment Charges [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2017	[1]			0
Credits				(4)
Utilization and other	[3]			4
Balance, July 1, 2018	[4]	0		0
Exit Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2017	[1]			66
Credits				0
Utilization and other	[3]			(28)
Balance, July 1, 2018	[4]	$ 38		$ 38

[1] Included in Other current liabilities ($643 million) and Other noncurrent liabilities ($462 million).

[2] In the three and six months ended July 1, 2018, restructuring credits are associated with cost-reduction and productivity initiatives not associated with acquisitions, as well as acquisition-related costs, primarily associated with Hospira. In the three and six months ended July 2, 2017, restructuring credits are largely associated with cost-reduction and productivity initiatives not associated with acquisitions, partially offset by charges related to our acquisition of mainly Anacor in the second quarter of 2017, and mainly Anacor and Medivation in the first six months of 2017. In the three and six months ended July 1, 2018, Employee terminations primarily include revisions of our estimates of severance benefits. Employee termination costs are generally recorded when the actions are probable and estimable and include accrued severance benefits, many of which may be paid out during periods after termination.The restructuring activities for 2018 are associated with the following:•For the second quarter of 2018, IH ($12 million income); EH ($2 million); manufacturing operations ($13 million); and Corporate ($26 million income).•For the first six months of 2018, IH ($12 million income); EH ($12 million income); WRD/GPD ($2 million income); manufacturing operations ($15 million); and Corporate ($22 million income).The restructuring activities for 2017 are associated with the following:•For the second quarter of 2017, IH ($8 million income); EH ($7 million); WRD/GPD ($14 million income); manufacturing operations ($8 million income); and Corporate ($1 million).•For the first six months of 2017, IH ($1 million income); EH ($11 million income); WRD/GPD ($26 million income); manufacturing operations ($9 million); and Corporate ($3 million).

[3] Includes adjustments for foreign currency translation.

[4] Included in Other current liabilities ($460 million) and Other noncurrent liabilities ($418 million).