CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017		Oct. 02, 2016
Statement of Comprehensive Income [Abstract]
Net income before allocation to noncontrolling interests	[1],[2],[3],[4]	$ 2,858	$ 1,355	$ 9,066	[5]	$ 6,465	[5]
Foreign currency translation adjustments, net	[3]	878	417	1,352		998
Reclassification adjustments	[3],[6]	(3)	0	110		0
Other comprehensive income (loss), foreign currency transaction and translation adjustment, before tax	[3]	875	417	1,461		998
Unrealized holding losses on derivative financial instruments, net	[3]	(50)	(126)	(149)		(970)
Reclassification adjustments for realized (gains)/losses	[3],[7]	56	150	(393)		280
Other comprehensive income (loss), derivatives qualifying as hedges, before tax, total	[3]	6	24	(542)		(690)
Unrealized holding gains on available-for-sale securities, net	[3]	384	261	698		740
Reclassification adjustments for realized gains	[3],[7]	(278)	(112)	(181)		(129)
Other comprehensive income (loss), available-for-sale securities adjustment, before tax, total	[3]	106	149	518		611
Benefit plans: actuarial losses, net	[3]	(103)	(82)	(41)		(101)
Reclassification adjustments related to amortization	[3],[8]	140	140	448		418
Reclassification adjustments related to settlements, net	[3],[8]	38	28	89		76
Other	[3]	(76)	69	(111)		51
Defined benefit plan, amounts recognized in other comprehensive income (loss), net gain (loss), before tax, total	[3]	(1)	155	384		444
Benefit plans: prior service (costs)/credits and other, net	[3]	0	95	(2)		182
Reclassification adjustments related to amortization	[3],[8]	(46)	(45)	(138)		(127)
Reclassification adjustments related to curtailments, net	[3],[8]	(3)	(8)	(14)		(14)
Other	[3]	1	6	2		12
Defined benefit plan, amounts recognized in other comprehensive income (loss), net prior service cost, before tax	[3]	(48)	48	(151)		54
Other comprehensive income, before tax	[3]	938	793	1,669		1,417
Tax provision/(benefit) on other comprehensive income	[3],[9]	(80)	116	(218)		111
Other comprehensive income before allocation to noncontrolling interests	[3]	1,018	677	1,888		1,306
Comprehensive income before allocation to noncontrolling interests	[3]	3,876	2,031	10,953		7,771
Less: Comprehensive income attributable to noncontrolling interests	[3]	19	0	48		24
Comprehensive income attributable to Pfizer Inc.	[3]	$ 3,857	$ 2,032	$ 10,906		$ 7,747

[1] Amounts for the three and nine months ended October 2, 2016 have been revised from previously reported amounts to reflect the adoption of a new accounting standard in the fourth quarter of 2016, as of January 1, 2016. For additional information, see Note 1B. Basis of Presentation and Significant Accounting Policies––Adoption of New Accounting Standards.

[2] Amounts may not add due to rounding.

[3] Amounts may not add due to rounding.

[4] Amounts may not add due to rounding.

[5] Amounts for the three and nine months ended October 2, 2016 have been revised from previously reported amounts to reflect the adoption of a new accounting standard in the fourth quarter of 2016, as of January 1, 2016. For additional information, see Note 1B. Basis of Presentation and Significant Accounting Policies: Adoption of New Accounting Standards.

[6] The foreign currency translation adjustments reclassified into Other (income)/deductions—net in the condensed consolidated statements of income primarily result from sale of our 40% ownership investment in Teuto. See Note 2D. Acquisitions, Sale of Hospira Infusion Systems Net Assets, Collaborative Arrangement and Equity-Method Investments: Equity-Method Investments.

[7] Reclassified into Other (income)/deductions—net and Cost of sales in the condensed consolidated statements of income. For additional information on amounts reclassified into Cost of sales, see Note 7F. Financial Instruments: Derivative Financial Instruments and Hedging Activities.

[8] Generally reclassified, as part of net periodic pension cost, into Cost of sales, Selling, informational and administrative expenses, and/or Research and development expenses, as appropriate, in the condensed consolidated statements of income. For additional information, see Note 10. Pension and Postretirement Benefit Plans.

[9] See Note 5C. Tax Matters: Tax Provision/(Benefit) on Other Comprehensive Income.