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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Sep. 30, 2019
Loss Contingencies [Line Items]      
Estimated asbestos related net liability on a discounted basis $ 132   $ 141
Reserves for environmental liabilities 151   159
Conditional asset retirement obligations 31   30
Accrued Environmental Loss Contingencies, Current 51   52
Accrued Environmental Loss Contingencies, Noncurrent 100   107
Liability for Asbestos and Environmental Claims, Gross 502   507
Restricted Cash and Investments 370   366
Restricted Cash and Cash Equivalents 12   16
Insurance Recoveries 76   77
Insurable liabilities 378   379
Insurance Settlements Receivable, Current 5   5
Insurance Settlements Receivable 23   23
Insurance Settlements Receivable, Noncurrent 18   18
Asbestos Issue [Member]      
Loss Contingencies [Line Items]      
Restricted Cash and Cash Equivalents 12   16
Restricted Investments 282   273
Accrued Compensation and Benefits [Member]      
Loss Contingencies [Line Items]      
Insurable liabilities 22   22
Other Current Assets      
Loss Contingencies [Line Items]      
Restricted Cash and Investments 42   46
Other Noncurrent Assets      
Loss Contingencies [Line Items]      
Restricted Cash and Investments 328   320
Other Noncurrent Liabilities [Member]      
Loss Contingencies [Line Items]      
Liability for Asbestos and Environmental Claims, Gross 452   457
Insurable liabilities 255   258
Other Current Liabilities      
Loss Contingencies [Line Items]      
Liability for Asbestos and Environmental Claims, Gross 50   50
Insurable liabilities $ 101   $ 99
Stanton Street Facility, Marinette, WI [Member]      
Loss Contingencies [Line Items]      
Environmental Remediation Expense   $ 140