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Summary of Principal Accounting Policies (Narrative) (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
country
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Accounting Policies [Abstract]      
Number of countries in which entity operates (country) | country 14    
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash $ 191,000,000 $ 237,000,000  
Level 3 assets and liabilities 0 0  
Depreciation 594,000,000 527,000,000 $ 515,000,000
Accounts payable outsourcing 1,200,000,000 1,600,000,000  
Research and development expense 579,000,000 563,000,000 582,000,000
Advertising expense 310,000,000 269,000,000 $ 304,000,000
Machinery and Equipment      
Restricted Cash and Cash Equivalents Items [Line Items]      
Retirement of machinery 221,000,000 450,000,000  
Property      
Restricted Cash and Cash Equivalents Items [Line Items]      
Retirement of machinery   503,000,000  
Other Current Assets      
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash $ 48,000,000 $ 50,000,000