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Employee Benefit (Details Textuals) (USD $)
In Millions, unless otherwise specified
1 Months Ended 6 Months Ended
Jul. 31, 2011
Jun. 30, 2011
Jun. 30, 2010
Additionals Employee Benefits (Textuals) [Abstract]      
Estimated contributions to employee pension plans   $ 1,450  
Employee Benefits (Textuals) [Abstract]      
Maximum annual increase percentage to company contribution for retiree medical coverage   4.00%  
Estimated contributions to employee pension plans at the end of the prior year   950  
Estimated contributions to U.S. employee pension plans at the end of the prior year   650  
Estimated contributions to international employee pension plans at the end of the prior year   300  
Contributions to employee pension plans   557 347
Company's contribution to U.S. plans in July, 2011 750 374  
Contributions to other postretirement benefit plans   99  
U.S. [Member]
     
Additionals Employee Benefits (Textuals) [Abstract]      
Estimated contributions to employee pension plans   1,150  
International [Member]
     
Additionals Employee Benefits (Textuals) [Abstract]      
Estimated contributions to employee pension plans   300  
Other Benefits [Member]
     
Additionals Employee Benefits (Textuals) [Abstract]      
Estimated contributions to employee pension plans   $ 126