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Segment Reporting - Operating Information by Segment (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 27, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]          
Loss on the sale of APP     $ (1) $ (103) $ (2)
Restructuring and integration costs   $ 14 31 103 106
Transaction costs   14 5 29 45
Impairment charges   18   18  
Accrued and unpaid capital expenditures reported in property, plant and equipment   127 $ 0 127 $ 0
Alloy Piping Products [Member]          
Segment Reporting Information [Line Items]          
Loss on the sale of APP $ (101)        
Operating Segments [Member] | NCSA [Member]          
Segment Reporting Information [Line Items]          
Impairment of intangible assets   $ 143      
Operating Segments [Member] | NCSA [Member] | Alloy Piping Products [Member]          
Segment Reporting Information [Line Items]          
Loss on the sale of APP       $ (101)