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Benefit Plans - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Settlement losses and other expenses $ 7 $ 3
Pension Plans | U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Settlement losses and other expenses 7 3
Employer contribution 1  
Estimated future employer contributions 38  
Pension Plans | Non-U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Settlement losses and other expenses 0 $ 1
Employer contribution 143  
Estimated future employer contributions 158  
Pension Plans | Non-U.S. Plans | United Kingdom and Ireland    
Defined Benefit Plan Disclosure [Line Items]    
Employer contribution $ 107