CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests	[1],[2],[3],[4]	$ 5,056	$ 3,879	$ 8,945	$ 7,449
Foreign currency translation adjustments, net	[4]	(485)	(699)	(161)	59
Reclassification adjustments	[4]	0	(35)	2	(20)
Other comprehensive income (loss), foreign currency transaction and translation adjustment, before tax	[4]	(485)	(734)	(159)	39
Unrealized holding gains/(losses) on derivative financial instruments, net	[4]	(176)	127	91	13
Reclassification adjustments for (gains)/losses included in net income	[4],[5]	(81)	310	(343)	354
Other comprehensive income (loss), derivatives qualifying as hedges, before tax, total	[4]	(256)	437	(252)	367
Unrealized holding gains/(losses) on available-for-sale securities, net	[4]	(7)	(374)	33	(214)
Reclassification adjustments for (gains)/losses included in net income	[4],[5]	26	143	37	(31)
Reclassification adjustments for unrealized gains included in Retained Earnings	[4],[6]	0	0	0	(462)
Other comprehensive income (loss), available-for-sale securities, before tax, total	[4]	19	(231)	70	(707)
Benefit plans: actuarial gains/(losses), net	[4]	(4)	(57)	(4)	106
Reclassification adjustments related to amortization	[4]	60	61	121	123
Reclassification adjustments related to settlements, net	[4]	2	30	2	67
Other	[4]	41	107	18	21
Defined benefit plan, amounts recognized in other comprehensive income (loss), net gain (loss), before tax, total	[4]	100	141	137	316
Benefit plans: prior service costs and other, net	[4]	(1)	0	(1)	0
Reclassification adjustments related to amortization of prior service costs and other, net	[4]	(46)	(46)	(93)	(92)
Reclassification adjustments related to curtailments of prior service costs and other, net	[4]	0	(7)	0	(13)
Other	[4]	1	(1)	2	1
Defined benefit plan, amounts recognized in other comprehensive income (loss), net prior service cost, before tax	[4]	(46)	(53)	(92)	(104)
Other comprehensive loss, before tax	[4]	(669)	(440)	(296)	(88)
Tax provision/(benefit) on other comprehensive loss	[4]	(59)	173	(34)	605
Other comprehensive loss before allocation to noncontrolling interests	[2],[4]	(610)	(613)	(262)	(693)
Comprehensive income before allocation to noncontrolling interests	[4]	4,446	3,266	8,683	6,755
Less: Comprehensive income/(loss) attributable to noncontrolling interests	[4]	12	(4)	13	6
Comprehensive income attributable to Pfizer Inc.	[4]	$ 4,434	$ 3,270	$ 8,669	$ 6,750

[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] Amounts may not add due to rounding.

[5] 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 7E. Financial Instruments: Derivative Financial Instruments and Hedging Activities.

[6] For additional information, see Notes to Consolidated Financial Statements—Note 1B. Basis of Presentation and Significant Accounting Policies: Adoption of New Accounting Standards in 2018 in our 2018 Financial Report.