CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended
		Apr. 03, 2022	Apr. 04, 2021
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests		$ 7,870	$ 4,886
Foreign currency translation adjustments, net		(363)	465
Unrealized holding gains/(losses) on derivative financial instruments, net		203	214
Reclassification adjustments for (gains)/losses included in net income	[1]	(213)	259
Other comprehensive income (loss), derivatives qualifying as hedges, before tax, total		(10)	473
Unrealized holding gains/(losses) on available-for-sale securities, net		(133)	79
Reclassification adjustments for (gains)/losses included in net income	[2]	233	(242)
Other comprehensive income (loss), available-for-sale securities, before tax, total		99	(163)
Reclassification adjustments related to amortization of prior service costs and other, net		(36)	(40)
Reclassification adjustments related to curtailments of prior service costs and other, net		(10)	0
Other		(1)	(3)
Defined benefit plan, amounts recognized in other comprehensive income (loss), net prior service cost, before tax		(47)	(43)
Other comprehensive income/(loss), before tax		(321)	732
Tax provision/(benefit) on other comprehensive income/(loss)		(60)	84
Other comprehensive income/(loss) before allocation to noncontrolling interests		(260)	647
Comprehensive income/(loss) before allocation to noncontrolling interests		7,610	5,533
Less: Comprehensive income/(loss) attributable to noncontrolling interests		6	10
Comprehensive income/(loss) attributable to Pfizer Inc.		$ 7,604	$ 5,523

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

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