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Acquisitions and Divestitures - Additional Information (Detail)
$ in Millions
1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Apr. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Apr. 30, 2016
USD ($)
Employees
Sep. 30, 2017
USD ($)
Employees
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]                
Third-party sale generated in last annual period prior to divestiture     $ 3,236 $ 3,138   $ 9,689 $ 9,427  
Restructuring and other charges     $ 19 $ 3   118 33  
LISI MEDICAL [Member]                
Business Acquisition [Line Items]                
Cash received on sale of operations   $ 102            
Sale of Remmele Medical business, net of transaction costs   $ 99            
Slim Aluminium [Member]                
Business Acquisition [Line Items]                
Third-party sale generated in last annual period prior to divestiture           $ 54 128  
Number of employees | Employees           312    
Cash expense related to sale of rolling mill $ 10              
Third party guarantee with a fair value related to environmental remediation $ 5              
Slim Aluminium [Member] | Restructuring and Other Charges [Member]                
Business Acquisition [Line Items]                
Loss on sale of rolling mill           $ 60    
RTI [Member]                
Business Acquisition [Line Items]                
Third-party sale generated in last annual period prior to divestiture         $ 23      
Number of employees | Employees         330      
Extrusions Business [Member] | Brazil [Member] | Transportation and Construction Solutions [Member]                
Business Acquisition [Line Items]                
Restructuring and other charges           $ 0 $ 0 $ 0