CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (PARENTHETICAL) - USD ($) $ in Millions		3 Months Ended
		Mar. 29, 2020	Mar. 31, 2019
Statement of Cash Flows [Abstract]
TCJA impact	[1],[2]	$ 0	$ (131)

[1] Amounts may not add due to rounding.

[2] As a result of the enactment of the TCJA in December 2017, Pfizer’s Provision for taxes on income for the three months ended March 31, 2019 was favorably impacted by approximately $131 million, primarily as a result of additional guidance issued by the U.S. Department of Treasury.