CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Oct. 01, 2017		Sep. 30, 2018		Oct. 01, 2017
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests	[1],[2],[3]	$ 4,122	$ 2,858		$ 11,571		$ 9,066
Foreign currency translation adjustments, net	[2]	(567)	878		(507)		1,352
Reclassification adjustments	[2]	(2)	(3)	[4]	(22)	[4]	110
Other comprehensive income (loss), foreign currency transaction and translation adjustment, before tax	[2]	(569)	875		(530)		1,461
Unrealized holding gains/(losses) on derivative financial instruments, net	[2]	222	(50)		236		(149)
Reclassification adjustments for (gains)/losses included in net income	[2],[4]	(235)	56		119		(393)
Other comprehensive income (loss), derivatives qualifying as hedges, before tax, total	[2]	(13)	6		355		(542)
Unrealized holding gains/(losses) on available-for-sale securities, net	[2]	149	384		(65)		698
Reclassification adjustments for gains included in net income	[2],[4]	(36)	(278)		(67)		(181)
Reclassification adjustments for unrealized gains included in Retained Earnings	[2],[5]	0	0		(462)		0
Other comprehensive income (loss), available-for-sale securities, before tax, total	[2]	112	106		(595)		518
Benefit plans: actuarial gains/(losses), net	[2]	8	(103)		114		(41)
Reclassification adjustments related to amortization	[2]	60	140		183		448
Reclassification adjustments related to settlements, net	[2]	42	38		108		89
Other	[2]	49	(76)		69		(111)
Defined benefit plan, amounts recognized in other comprehensive income (loss), net gain (loss), before tax, total	[2]	158	(1)		474		384
Benefit plans: prior service costs and other, net	[2]	0	0		0		(2)
Reclassification adjustments related to amortization	[2]	(46)	(46)		(137)		(138)
Reclassification adjustments related to curtailments, net	[2]	(4)	(3)		(18)		(14)
Other	[2]	0	1		1		2
Defined benefit plan, amounts recognized in other comprehensive income (loss), net prior service cost, before tax	[2]	(50)	(48)		(154)		(151)
Other comprehensive income/(loss), before tax	[2]	(361)	938		(449)		1,669
Tax provision/(benefit) on other comprehensive income/(loss)	[2]	62	(80)		667		(218)
Other comprehensive income/(loss) before allocation to noncontrolling interests	[2]	(422)	1,018		(1,116)		1,888
Comprehensive income before allocation to noncontrolling interests	[2]	3,700	3,876		10,455		10,953
Less: Comprehensive income attributable to noncontrolling interests	[2]	0	19		5		48
Comprehensive income attributable to Pfizer Inc.	[2]	$ 3,700	$ 3,857		$ 10,450		$ 10,906

[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.