CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (PARENTHETICAL) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2019	Jul. 01, 2018
Statement of Cash Flows [Abstract]
TCJA benefit	[1],[2]	$ 285	$ 68

[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 (i) the six months ended June 30, 2019 was favorably impacted by approximately $285 million, primarily as a result of additional guidance issued by the U.S. Department of Treasury and (ii) the six months ended July 1, 2018 was favorably impacted by approximately $68 million, primarily related to certain tax initiatives associated with the lower U.S. tax rate as a result of the TCJA.