CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests		$ 9,911	$ 5,589	$ 17,781	$ 10,475
Foreign currency translation adjustments, net		(1,268)	36	(1,631)	501
Unrealized holding gains/(losses) on derivative financial instruments, net		651	(248)	854	(35)
Reclassification adjustments for (gains)/losses included in net income	[1]	(144)	(21)	(357)	238
Other comprehensive income (loss), derivatives qualifying as hedges, before tax, total		507	(270)	497	203
Unrealized holding gains/(losses) on available-for-sale securities, net		(486)	59	(620)	138
Reclassification adjustments for (gains)/losses included in net income	[2]	255	61	487	(181)
Other comprehensive income (loss), available-for-sale securities, before tax, total		(232)	120	(132)	(43)
Reclassification adjustments related to amortization of prior service costs and other, net		(31)	(39)	(68)	(79)
Reclassification adjustments related to curtailments of prior service costs and other, net		1	(1)	(10)	(5)
Defined benefit plan, amounts recognized in other comprehensive income (loss), net prior service cost, before tax		(30)	(41)	(78)	(84)
Other comprehensive income/(loss), before tax		(1,023)	(155)	(1,344)	577
Tax provision/(benefit) on other comprehensive income/(loss)		(55)	(63)	(115)	21
Other comprehensive income/(loss) before allocation to noncontrolling interests		(968)	(92)	(1,228)	556
Comprehensive income/(loss) before allocation to noncontrolling interests		8,943	5,498	16,553	11,031
Less: Comprehensive income/(loss) attributable to noncontrolling interests		0	28	6	38
Comprehensive income/(loss) attributable to Pfizer Inc.		$ 8,943	$ 5,469	$ 16,546	$ 10,992

[1] Reclassified into Other (income)/deductions—net and Cost of sales. See Note 7E.

[2] Reclassified into Other (income)/deductions—net.