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Earnings Per Share - Additional Information (Detail) - $ / shares
shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Basic average number of share     19   7
Weighted average number of shares outstanding   438 427 438 414
Weighted Average [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Number of anti-dilutive securities     8   3
RTI [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Number of common stock shares issued in a part of acquisition 29        
Weighted average number of shares outstanding     29   29
Mandatory Convertible Notes [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Number of anti-dilutive securities   26 26 26 26
Equity Unit Purchase Agreements [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Number of anti-dilutive securities       8 9
Stock Options [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Weighted average exercise price of options       $ 38.16 $ 38.28
Convertible Notes [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Number of anti-dilutive securities       9