CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Apr. 01, 2018	Apr. 02, 2017
Income Statement [Abstract]
Revenues	[1]	$ 12,906	$ 12,779
Costs and expenses:
Cost of sales	[1],[2]	2,563	2,468
Selling, informational and administrative expenses	[1],[2]	3,412	3,315
Research and development expenses	[1],[2]	1,743	1,716
Amortization of intangible assets	[1]	1,196	1,186
Restructuring charges and certain acquisition-related costs	[1]	43	84
Other (income)/deductions––net	[1]	(178)	60
Income from continuing operations before provision for taxes on income	[1],[3]	4,127	3,951
Provision for taxes on income	[1]	556	821
Income from continuing operations	[1]	3,571	3,130
Discontinued operations––net of tax	[1]	(1)	0
Net income before allocation to noncontrolling interests	[1],[4],[5]	3,570	3,130
Less: Net income attributable to noncontrolling interests	[1]	9	9
Net income attributable to Pfizer Inc.	[1]	$ 3,561	$ 3,121
Earnings per common share––basic:
Income from continuing operations attributable to Pfizer Inc. common shareholders (in dollars per share)	[1]	$ 0.60	$ 0.52
Discontinued operations––net of tax (in dollars per share)	[1]	0.00	0.00
Net income attributable to Pfizer Inc. common shareholders (in dollars per share)	[1]	0.60	0.52
Earnings per common share––diluted:
Income from continuing operations attributable to Pfizer Inc. common shareholders (in dollars per share)	[1]	0.59	0.51
Discontinued operations––net of tax (in dollars per share)	[1]	0.00	0.00
Net income attributable to Pfizer Inc. common shareholders (in dollars per share)	[1]	$ 0.59	$ 0.51
Weighted-average shares––basic	[1]	5,957	6,006
Weighted-average shares––diluted	[1]	6,057	6,092
Cash dividends paid per common share (in dollars per share)	[1]	$ 0.34	$ 0.32

[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 in the first quarter of 2018 and 2017 include dividend income of $59 million and $43 million, 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.