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Benefit Plans - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
arrangement
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
arrangement
Jun. 30, 2017
USD ($)
Apr. 01, 2018
arrangement
U.S. Plans          
Defined Benefit Plan Disclosure [Line Items]          
Settlement losses and other expenses $ 3 $ 11 $ 3 $ 11  
U.S. Plans | Multiemployer Plans, Pension | Fund | BCTGM          
Defined Benefit Plan Disclosure [Line Items]          
Multiemployer plan, number of expired collective-bargaining arrangements | arrangement 8   8   8
Multiemployer plan, number of collective-bargaining arrangements | arrangement 7   7    
U.S. Plans | Multiemployer Plans, Pension | Fund | BCTGM | North America          
Defined Benefit Plan Disclosure [Line Items]          
Multiemployer plan, partial withdrawal liability $ 567   $ 567    
Multiemployer plan, withdrawal obligation 408   408    
Multiemployer plan, withdrawal obligation, net of tax $ 305        
Multiemployer plan, withdrawal obligation term 20 years        
Pension Plans | U.S. Plans          
Defined Benefit Plan Disclosure [Line Items]          
Settlement losses and other expenses $ 8 18 15 21  
Employer contribution     5    
Estimated future employer contributions 34   34    
Pension Plans | Non-U.S. Plans          
Defined Benefit Plan Disclosure [Line Items]          
Settlement losses and other expenses 0 $ 1 0 $ 2  
Employer contribution     199    
Estimated future employer contributions $ 102   102    
Pension Plans | Non-U.S. Plans | United Kingdom and Ireland          
Defined Benefit Plan Disclosure [Line Items]          
Employer contribution     $ 137