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Pension and Postretirement Benefit Plans (Narratives) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Item
Dec. 31, 2012
Mar. 31, 2011
LimitedPartner
Jun. 30, 2013
Maximum
Jun. 30, 2013
Minimum
Jun. 30, 2013
Qualified and Non-qualified Pension Benefits
Jun. 30, 2013
Postretirement Benefits
Benefit Plan Information              
Contributions made to the Company's plans           $ 168 $ 3
Estimated pension and postretirement employer contributions in current fiscal year       500 400    
Number of additional limited partners of WG Trading Company, in addition to 3M, who objected and appealed the court's order to the United States Court of Appeals for the Second Circuit     6        
Percentage of WG Trading Company holdings in relation to total fair value of the company's total plan assets, high end of range (as a percent)   1.00%          
Special termination benefits - number of additional years of pension service 1 year            
Special termination benefits - number of additional years of age for certain benefit calculations 1 year            
Special termination benefits - number of participants 616            
Special termination benefits charge $ 26