CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Income Statement [Abstract]
Revenues	[1]	$ 13,298	$ 13,168	$ 39,670	$ 38,843
Costs and expenses:
Cost of sales	[1],[2]	2,694	2,844	8,173	7,972
Selling, informational and administrative expenses	[1],[2]	3,494	3,504	10,448	10,249
Research and development expenses	[1],[2]	2,008	1,865	5,549	5,367
Amortization of intangible assets	[1]	1,253	1,177	3,640	3,571
Restructuring charges and certain acquisition-related costs	[1]	85	114	172	267
Other (income)/deductions––net	[1]	(414)	79	(1,143)	65
Income from continuing operations before provision for taxes on income	[1],[3]	4,177	3,585	12,831	11,351
Provision for taxes on income	[1]	66	727	1,270	2,287
Income from continuing operations	[1]	4,111	2,858	11,562	9,064
Discontinued operations––net of tax	[1]	11	0	10	1
Net income before allocation to noncontrolling interests	[1],[4],[5]	4,122	2,858	11,571	9,066
Less: Net income attributable to noncontrolling interests	[1]	8	18	25	32
Net income attributable to Pfizer Inc.	[1]	$ 4,114	$ 2,840	$ 11,546	$ 9,034
Earnings per common share––basic:
Income from continuing operations attributable to Pfizer Inc. common shareholders (in dollars per share)	[1]	$ 0.70	$ 0.48	$ 1.96	$ 1.51
Discontinued operations––net of tax (in dollars per share)	[1]	0.00	0.00	0.00	0.00
Net income attributable to Pfizer Inc. common shareholders (in dollars per share)	[1]	0.70	0.48	1.96	1.51
Earnings per common share––diluted:
Income from continuing operations attributable to Pfizer Inc. common shareholders (in dollars per share)	[1]	0.69	0.47	1.92	1.49
Discontinued operations––net of tax (in dollars per share)	[1]	0.00	0.00	0.00	0.00
Net income attributable to Pfizer Inc. common shareholders (in dollars per share)	[1]	$ 0.69	$ 0.47	$ 1.92	$ 1.49
Weighted-average shares––basic	[1]	5,875	5,951	5,899	5,972
Weighted-average shares––diluted	[1]	5,986	6,041	5,998	6,057
Cash dividends paid per common share (in dollars per share)	[1]	$ 0.34	$ 0.32	$ 1.02	$ 0.96

[1] Amounts may not add due to rounding.

[2] Excludes amortization of intangible assets, except as disclosed in Note 9A. Identifiable Intangible Assets and Goodwill: Identifiable Intangible Assets.

[3] Income from continuing operations before provision for taxes on income. IH’s earnings include dividend income of $91 million and $54 million in the third quarter of 2018 and 2017, respectively, and $226 million and $211 million in the first nine months of 2018 and 2017, respectively, from our investment in ViiV. For additional information, see Note 4.

[4] Amounts may not add due to rounding.

[5] Amounts may not add due to rounding.