CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended
		Apr. 01, 2018	Apr. 02, 2017
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests	[1],[2],[3]	$ 3,570	$ 3,130
Foreign currency translation adjustments, net	[2]	758	228
Reclassification adjustments	[2]	15	0
Other comprehensive income (loss), foreign currency transaction and translation adjustment, before tax	[2]	773	228
Unrealized holding losses on derivative financial instruments, net	[2]	(114)	(9)
Reclassification adjustments for (gains)/losses included in net income	[2],[4]	44	(241)
Other comprehensive income (loss), derivatives qualifying as hedges, before tax, total	[2]	(69)	(251)
Unrealized holding gains on available-for-sale securities, net	[2]	160	150
Reclassification adjustments for (gains)/losses included in net income	[2],[4]	(174)	137
Reclassification adjustments for unrealized gains included in Retained Earnings	[2],[5]	(462)	0
Other comprehensive income (loss), available-for-sale securities, before tax, total	[2]	(476)	287
Benefit plans: actuarial gains, net	[2]	163	1
Reclassification adjustments related to amortization	[2]	62	163
Reclassification adjustments related to settlements, net	[2]	37	52
Other	[2]	(86)	45
Defined benefit plan, amounts recognized in other comprehensive income (loss), net gain (loss), before tax, total	[2]	175	261
Benefit plans: prior service (costs)/credits and other, net	[2]	0	0
Reclassification adjustments related to amortization	[2]	(46)	(45)
Reclassification adjustments related to curtailments, net	[2]	(7)	(7)
Other	[2]	2	1
Defined benefit plan, amounts recognized in other comprehensive income (loss), net prior service cost, before tax	[2]	(51)	(52)
Other comprehensive income, before tax	[2]	352	474
Tax provision on other comprehensive (loss)/income	[2]	432	25
Other comprehensive (loss)/income before allocation to noncontrolling interests	[2]	(80)	449
Comprehensive income before allocation to noncontrolling interests	[2]	3,490	3,579
Less: Comprehensive income attributable to noncontrolling interests	[2]	10	15
Comprehensive income attributable to Pfizer Inc.	[2]	$ 3,480	$ 3,563

[1] Amounts may not add due to rounding.

[2] Amounts may not add due to rounding.

[3] Amounts may not add due to rounding.

[4] Reclassified into Other (income)/deductions—net and Cost of sales in the condensed consolidated statements of income. For additional information on amounts reclassified into Cost of sales, see Note 7F. Financial Instruments: Derivative Financial Instruments and Hedging Activities.

[5] For additional information, see Note 1B. Basis of Presentation and Significant Accounting Policies: Adoption of New Accounting Standards.