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Segment Reporting - Operating Information by Segment (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 27, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]          
Loss on the sale of APP   $ (102) $ (1) $ (103) $ (1)
Restructuring and integration costs   20 63 89 75
Transaction costs   11 37 15 40
Accrued and unpaid capital expenditures reported in property, plant and equipment and accrued liabilities   47 $ 14 47 $ 14
Alloy Piping Products [Member]          
Segment Reporting Information [Line Items]          
Loss on the sale of APP $ (101)        
Operating Segments [Member] | NCSA [Member] | Alloy Piping Products [Member]          
Segment Reporting Information [Line Items]          
Loss on the sale of APP   $ (101)   $ (101)