Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests		$ 22,025	$ 9,195	$ 16,056
Foreign currency translation adjustments, net		(682)	772	675
Reclassification adjustments		0	(17)	(288)
Other comprehensive income (loss), foreign currency transaction and translation adjustment, before tax, total		(682)	755	387
Unrealized holding gains/(losses) on derivative financial instruments, net		526	(582)	476
Reclassification adjustments for (gains)/losses included in net income	[1]	134	21	(664)
Other comprehensive income (loss), derivatives qualifying as hedges, before tax, total		660	(561)	(188)
Unrealized holding gains/(losses) on available-for-sale securities, net		(355)	361	(1)
Reclassification adjustments for (gains)/losses included in net income	[2]	(30)	(188)	39
Other comprehensive income (loss), available-for-sale securities adjustment, before tax, total		(384)	173	38
Benefit plans: prior service (costs)/credits and other, net		116	52	(7)
Reclassification adjustments related to amortization of prior service costs and other, net		(154)	(176)	(181)
Reclassification adjustments related to curtailments of prior service costs and other, net		(74)	0	(2)
Other		(2)	0	1
Other comprehensive income (loss), benefit plans, prior service (costs)/credits, before tax, total		(113)	(124)	(189)
Other comprehensive income/(loss), before tax		(519)	243	48
Tax provision/(benefit) on other comprehensive income/(loss)		71	(227)	178
Other comprehensive income/(loss), net of tax		(589)	471	(130)
Comprehensive income/(loss) before allocation to noncontrolling interests		21,435	9,666	15,926
Less: Comprehensive income/(loss) attributable to noncontrolling interests		43	27	18
Comprehensive income/(loss) attributable to Pfizer Inc.		$ 21,393	$ 9,639	$ 15,908

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

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