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Contingencies and Commitments - Changes in Accrued Liabilities for Remediation Activities (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Change in Accrued Liabilities for Remediation Activities [Roll Forward]  
Beginning of period $ 179
Accruals for environmental remediation deemed probable and reasonably estimable 2
Obligations settled (4)
End of period $ 177