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Accumulated Other Comprehensive Income (Loss) - Narrative (Details)
$ in Millions
3 Months Ended
Jan. 01, 2018
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
May 31, 2015
EUR (€)
May 31, 2014
EUR (€)
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Adoption of new accounting guidance related to reclassification of certain tax effects $ 45 $ 0 $ 45      
Cumulative translation adjustment losses, net of tax   1,300 902      
Unrecognized pension and other postretirement benefits costs, net of tax   360 $ 338      
Net Investment Hedging | Euro Notes            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income related to net investment hedge unrealized gain   237   $ 187    
Euro Notes Issued May 2015 | Net Investment Hedging | Euro Notes            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Face value of notes | €         € 1,000,000,000.0  
Long-term debt   1,100        
Euro Notes Issued May 2014 | Net Investment Hedging | Euro Notes            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Face value of notes | €           € 1,000,000,000.0
Long-term debt   $ 1,100