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Restructuring Activities - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Restructuring And Related Activities [Abstract]          
Restructuring charges $ 3   $ 45 [1]    
Restructuring charges 5 $ 19 52 $ 108  
Restructuring reserve 29   29   $ 68
Restructuring actions for remaining liabilities, Current $ 26   $ 26    
[1] Excludes charges related to operating lease right-of-use assets of $7 million. Includes $6 million of adjustments related to changes in previous productivity initiatives.