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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating Activities      
Net income before allocation to noncontrolling interests $ 10,051 $ 8,288 $ 8,643
Adjustments to reconcile net income before allocation to noncontrolling interests to net cash provided by operating activities:      
Depreciation and amortization 9,026 [1],[2] 8,487 [1] 4,757 [1],[2]
Share-based compensation expense 419 405 349
Asset write-offs and impairment charges 1,198 3,486 305
Acquisition-related in-process research and development charges   125 68
(Gain)/loss on disposals 15 (155) (670)
(Gain)/loss on sale of discontinued operations (1,688) 11 (15)
Deferred taxes from continuing operations 264 1,937 (9,590)
Deferred taxes on discontinued operations 190 16 8
Benefit plan contributions (in excess of)/less than expense (1,775) (688) 546
Other non-cash adjustments (189) (19) 199
Other changes in assets and liabilities, net of acquisitions and divestitures:      
Accounts receivable (66) (608) 252
Inventories 1,084 2,917 1,631
Other assets 582 (906) (851)
Accounts payable and other liabilities 1,147 824 1,501
Other tax accounts, net (18) (12,666) 9,454
Net cash provided by operating activities 20,240 11,454 16,587
Investing Activities      
Purchases of property, plant and equipment (1,660) (1,513) (1,205)
Purchases of short-term investments (18,428) (10,931) (35,331)
Proceeds from redemptions and sales of short-term investments 13,615 4,543 42,364
Net proceeds from redemptions and sales of short-term investments with original maturities of 90 days or less 10,874 5,950 5,775
Purchases of long-term investments (4,063) (3,920) (6,888)
Proceeds from redemptions and sales of long-term investments 2,147 4,381 6,504
Proceeds from redemptions of short-term loans 561 1,156 1,158
Issuances of short-term loans (19) (151) (565)
Proceeds from redemptions of long-term loans   356  
Issuances of long-term loans (200) (208) (61)
Acquisitions, net of cash acquired (3,282) (273) (43,123)
Proceeds from sale of business 2,376    
Other investing activities 279 118 100
Net cash provided by/(used in) investing activities 2,200 (492) (31,272)
Financing Activities      
Proceeds from short-term borrowings 12,810 6,400 31,159
Principal payments on short-term borrowings (3,826) (9,249) (34,969)
Net proceeds/(payments) on short-term borrowings with original maturities of 90 days or less (7,540) (1,297) 874
Proceeds from issuances of long-term debt 1   24,023
Principal payments on long-term debt (6,986) (6) (967)
Purchases of common stock (9,000) (1,000)  
Cash dividends paid (6,234) (6,088) (5,548)
Other financing activities 168 66 (91)
Net cash provided by/(used in) financing activities (20,607) (11,174) 14,481
Effect of exchange-rate changes on cash and cash equivalents (29) (31) 60
Net increase/(decrease) in cash and cash equivalents 1,804 (243) (144)
Cash and cash equivalents at beginning of year 1,735 1,978 2,122
Cash and cash equivalents at end of year 3,539 1,735 1,978
Supplemental Cash Flow Information      
Non-cash transactions-Acquisition of Wyeth, treasury stock issued     23,303
Cash paid during the period for:      
Income taxes 2,938 11,775 2,300
Interest $ 2,085 $ 2,155 $ 935
[1] Certain production facilities are shared. Depreciation is allocated based on estimates of physical production.
[2] For 2011, includes King commencing on the acquisition date of January 31, 2011. For 2009, includes Wyeth commencing on the acquisition date of October 15, 2009.