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Summary of Principal Accounting Policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
country
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Restricted Cash and Cash Equivalents Items [Line Items]      
Number of countries in which entity operates (in countries) | country 14    
Restricted cash $ 155,000,000 $ 191,000,000  
Depreciation 584,000,000 594,000,000 $ 527,000,000
Gain (loss) on sale of property, plant, and equipment 0 0 0
Impairment of long-lived assets 0 0 0
Goodwill, impairment loss 0    
Impairment of indefinite lived intangible assets 0    
Accounts payable outsourcing 1,300,000,000 1,200,000,000  
Research and development expense 604,000,000 579,000,000 563,000,000
Advertising expense 366,000,000 310,000,000 $ 269,000,000
Machinery and Equipment      
Restricted Cash and Cash Equivalents Items [Line Items]      
Retirement of machinery 38,000,000 11,000,000  
Other Current Assets      
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash 45,000,000 48,000,000  
Accounting Standards Update 2015-17      
Restricted Cash and Cash Equivalents Items [Line Items]      
Deferred tax assets   451,000,000  
Deferred tax liabilities   19,000,000  
Significant unobservable inputs (Level 3)      
Restricted Cash and Cash Equivalents Items [Line Items]      
Level 3 assets and liabilities $ 0 $ 0