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Summary of Principal Accounting Policies (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
segments
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]      
Number of Countries in which Entity Operates 11    
Number of Operating Segments 4    
Depreciation $ 515,000,000 $ 521,000,000 $ 530,000,000
Retirement of Property 163,000,000 558,000,000  
Accounts Payable Outsourcing 1,300,000,000 1,200,000,000  
Research and Development Expense 582,000,000 553,000,000 578,000,000
Advertising Expense $ 304,000,000 $ 273,000,000 $ 275,000,000