CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended
		Apr. 02, 2023	Apr. 03, 2022
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests		$ 5,556	$ 7,870
Foreign currency translation adjustments, net		101	(363)
Unrealized holding gains/(losses) on derivative financial instruments, net		2	203
Reclassification adjustments for (gains)/losses included in net income	[1]	303	(213)
Other comprehensive income (loss), derivatives qualifying as hedges, before tax, total		305	(10)
Unrealized holding gains/(losses) on available-for-sale securities, net		87	(133)
Reclassification adjustments for (gains)/losses included in net income	[2]	(509)	233
Other comprehensive income (loss), available-for-sale securities, before tax, total		(422)	99
Reclassification adjustments related to amortization of prior service costs and other, net		(30)	(36)
Reclassification adjustments related to curtailments of prior service costs and other, net		(5)	(11)
Defined benefit plan, amounts recognized in other comprehensive income (loss), net prior service cost, before tax		(35)	(47)
Other comprehensive income/(loss), before tax		(50)	(321)
Tax provision/(benefit) on other comprehensive income/(loss)		(63)	(60)
Other comprehensive income/(loss) before allocation to noncontrolling interests		12	(260)
Comprehensive income/(loss) before allocation to noncontrolling interests		5,569	7,610
Less: Comprehensive income/(loss) attributable to noncontrolling interests		10	6
Comprehensive income/(loss) attributable to Pfizer Inc.		$ 5,558	$ 7,604

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

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