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Provision for Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Income Taxes Information [Line Items]    
Exchange losses associated with hedging program $ 157 $ 133
Tax effect of net carryforwards/backs, net of valuation allowances 1,298  
Tax effect of net carryforwards/backs, net of valuation allowances, not subject to expiration 1,074  
Unremitted earnings of subsidiaries outside the U.S. 13,179  
Expires after 2012 but before 2017 [Member]
   
Income Taxes Information [Line Items]    
Tax effect of net carryforwards/backs, net of valuation allowances 42  
Expiration date of net carryforwards/backs before the end of 2017  
Expires after 2017 [Member]
   
Income Taxes Information [Line Items]    
Tax effect of net carryforwards/backs, net of valuation allowances $ 182  
Expiration date of net carryforwards/backs after 2017