Earnings Per Common Share Attributable to Common Shareholders (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Apr. 03, 2016	Mar. 29, 2015
EPS Numerator––Basic
Income from continuing operations	[1]	$ 3,026	$ 2,376
Less: Net income attributable to noncontrolling interests		9	6
Income from continuing operations attributable to Pfizer Inc.		3,016	2,371
Less: Preferred stock dividends––net of tax		0	0
Income from continuing operations attributable to Pfizer Inc. common shareholders		3,016	2,370
Discontinued operations––net of tax	[1]	0	5
Less: Discontinued operations––net of tax, attributable to noncontrolling interests		0	0
Discontinued operations––net of tax, attributable to Pfizer Inc. common shareholders		0	5
Net income attributable to Pfizer Inc. common shareholders		3,016	2,375
Income from continuing operations attributable to Pfizer Inc. common shareholders and assumed conversions		3,016	2,371
Net income attributable to Pfizer Inc. common shareholders and assumed conversions		$ 3,016	$ 2,376
EPS Denominator
Weighted-average number of common shares outstanding––Basic	[1]	6,150	6,203
Common-share equivalents: stock options, stock issuable under employee compensation plans, convertible preferred stock and accelerated share repurchase agreement (shares)		64	90
Weighted-average number of common shares outstanding––Diluted	[1]	6,214	6,292
Equity Option [Member]
EPS Denominator
Stock options that had exercise prices greater than the average market price of our common stock issuable under employee compensation plans (shares)	[2]	86	34

[1] Amounts may not add due to rounding.

[2] These common stock equivalents were outstanding for the three months ended April 3, 2016 and March 29, 2015, but were not included in the computation of diluted EPS for those periods because their inclusion would have had an anti-dilutive effect.