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Benefit Plans - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
arrangement
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
arrangement
Sep. 30, 2017
USD ($)
Apr. 01, 2018
arrangement
U.S. Plans          
Defined Benefit Plan Disclosure [Line Items]          
Settlement losses and other expenses $ 3   $ 3    
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 $ 4 $ 6 19 $ 27  
Employer contribution     6    
Estimated future employer contributions 33   33    
Pension Plans | Non-U.S. Plans          
Defined Benefit Plan Disclosure [Line Items]          
Settlement losses and other expenses 0 0 0 2  
Employer contribution     253    
Estimated future employer contributions $ 48   48    
Pension Plans | Non-U.S. Plans | United Kingdom and Ireland          
Defined Benefit Plan Disclosure [Line Items]          
Employer contribution     $ 168    
Simplify to Grow Program | U.S. Plans          
Defined Benefit Plan Disclosure [Line Items]          
Settlement losses and other expenses   $ 1   $ 12