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Summary of Significant Accounting Policies (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
country
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
segment
country
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2019
USD ($)
Jul. 01, 2018
Summary Of Significant Accounting Policies [Line Items]                          
Number of countries in which products are sold (over 150) | country 150               150        
Number of operating segments | segment                 4        
Net revenues $ 6,773 $ 6,288 $ 6,112 $ 6,765 $ 6,966 $ 6,530 $ 5,986 $ 6,414 $ 25,938 $ 25,896 [1] $ 25,923 [1]    
Number of countries in which entity operates (over 80) | country 80               80        
Outstanding principal amount of receivables sold under factoring arrangement $ 819       $ 843       $ 819 843 677    
Advertising expense                 1,173 1,248 1,396    
Research and development expense                 362 366 376    
Europe                          
Summary Of Significant Accounting Policies [Line Items]                          
Weighted-average cost of capital rate                         7.30%
North America                          
Summary Of Significant Accounting Policies [Line Items]                          
Weighted-average cost of capital rate                         7.30%
Latin America                          
Summary Of Significant Accounting Policies [Line Items]                          
Risk-rated discount rate                         10.30%
AMEA                          
Summary Of Significant Accounting Policies [Line Items]                          
Risk-rated discount rate                         10.30%
Minimum | ASU 2016-02 | Scenario, Forecast | Subsequent Event                          
Summary Of Significant Accounting Policies [Line Items]                          
ROU assets for operating leases                       $ 650  
Operating lease liabilities                       650  
Current operating lease liabilities                       240  
Long-term operating lease liabilities                       410  
Maximum                          
Summary Of Significant Accounting Policies [Line Items]                          
Incremental cost of factoring receivables                 $ 10 $ 10 $ 10    
Maximum | ASU 2016-02 | Scenario, Forecast | Subsequent Event                          
Summary Of Significant Accounting Policies [Line Items]                          
ROU assets for operating leases                       800  
Operating lease liabilities                       800  
Current operating lease liabilities                       290  
Long-term operating lease liabilities                       $ 510  
Machinery and equipment | Minimum                          
Summary Of Significant Accounting Policies [Line Items]                          
Useful life, in years                 3 years        
Machinery and equipment | Maximum                          
Summary Of Significant Accounting Policies [Line Items]                          
Useful life, in years                 20 years        
Buildings and building improvements | Maximum                          
Summary Of Significant Accounting Policies [Line Items]                          
Useful life, in years                 40 years        
Software | Maximum                          
Summary Of Significant Accounting Policies [Line Items]                          
Useful life, in years                 7 years        
Argentina                          
Summary Of Significant Accounting Policies [Line Items]                          
Net monetary liabilities $ 1               $ 1        
Net revenues                 $ 469        
Percentage of consolidated net revenues                 1.80%        
U.K. | Geographic Concentration Risk | Net Revenues                          
Summary Of Significant Accounting Policies [Line Items]                          
Concentration risk percentage                 8.60%        
Selling, general and administrative expenses | Argentina                          
Summary Of Significant Accounting Policies [Line Items]                          
Remeasurement loss due to inflationary accounting                 $ 11        
[1] During the first quarter of 2018, we realigned some of our products across product categories and as such, we reclassified the product category net revenues on a basis consistent with the 2018 presentation.