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Supplemental Cash Flow Information (Details)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2010
USD ($)
Mar. 31, 2010
JPY (¥)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2010
JPY (¥)
Dec. 31, 2009
USD ($)
Y
Dec. 31, 2009
United States Qualified and Non-qualified Pension Benefits
USD ($)
Apr. 30, 2010
A-One
JPY (¥)
Mar. 31, 2010
Sumitomo 3M Limited
JPY (¥)
Supplemental Cash Flow Information                  
Cash income tax payments, net of refunds     $ 1,542 $ 1,509   $ 834      
Cash interest payments     219 178   233      
Capitalized interest     19 17   27      
Investing and financing activities with significant non-cash components                  
Cash paid to purchase shares held by Sumitomo Electric Industries, Ltd. 63 5,800              
Note payable issued to Sumitomo Electric Industries 188 17,400             17,400
Five-year financed liability of 1.7 billion in Japanese Yen       18 1,700     1,700  
Capital lease asset and obligation related to IT investment           50      
Amortization period of IT investment (in years)           7      
Contribution to U.S. defined benefit pension plan in common stock             $ 600