CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended
		Mar. 30, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests		$ 2,973	$ 3,123
Foreign currency translation adjustments, net		(557)	140
Unrealized holding gains/(losses) on derivative financial instruments, net		(123)	217
Reclassification adjustments for (gains)/losses included in net income/(loss)	[1]	(313)	(12)
Other comprehensive income, cash flow hedge, gain (loss), before tax, total		(436)	205
Unrealized holding gains/(losses) on available-for-sale securities, net		(31)	(51)
Reclassification adjustments for (gains)/losses included in net income/(loss)	[2]	155	(14)
Other comprehensive income (loss), available-for-sale securities, before tax, total		124	(65)
Reclassification adjustments related to amortization of prior service costs and other, net		(30)	(28)
Reclassification adjustments related to curtailments of prior service costs and other, net		(33)	0
Defined benefit plan, amounts recognized in other comprehensive income (loss), net prior service costs and other, before tax		(64)	(28)
Other comprehensive income/(loss), before tax		(932)	251
Tax provision/(benefit) on other comprehensive income/(loss)		(191)	53
Other comprehensive income/(loss) before allocation to noncontrolling interests		(741)	198
Comprehensive income/(loss) before allocation to noncontrolling interests		2,232	3,321
Less: Comprehensive income/(loss) attributable to noncontrolling interests		4	3
Comprehensive income/(loss) attributable to Pfizer Inc.		$ 2,229	$ 3,319

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

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