CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (PARENTHETICAL) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017
Statement of Cash Flows [Abstract]
TCJA benefit	$ 410	$ 0	[1],[2]

[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 nine months ended September 30, 2018 was favorably impacted by approximately $410 million, primarily related to certain tax initiatives associated with the TCJA, as well as favorable adjustments to the provisional estimates of the legislation. See Note 5A. Tax Matters: Taxes on Income from Continuing Operations.