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Accumulated Other Comprehensive Income (Loss) - Narrative (Details)
$ in Millions
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
USD ($)
May 31, 2015
EUR (€)
May 31, 2014
EUR (€)
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative translation adjustment losses, net of tax $ 1,500     $ 1,300    
Unrecognized pension and other postretirement benefits costs, net of tax 371     $ 355    
Net Investment Hedging | Euro Notes            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income related to net investment hedge unrealized gain 232 $ 239        
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          
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 June 2019 | Net Investment Hedging | Euro Notes            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Face value of notes | €     € 1,600,000,000      
Long-term debt $ 1,800