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Accumulated Other Comprehensive Income (Loss) - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
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      
Cumulative translation adjustment losses, net of tax 902 1,200      
Unrecognized pension and other postretirement benefits costs, net of tax 338 $ 395      
Net Investment Hedging | Euro Notes          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive income related to net investment hedge unrealized gain 22   $ 81    
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 1,200        
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 $ 1,200