Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	May 31, 2016
Significant Accounting Policies [Line Items]
Goodwill impairment charge				$ 353
Long-lived asset impairment charge			$ 23	209
Provision (benefit) for income taxes			13	75
Value of inventories under FIFO method	$ 30		$ 28
Buildings [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			20 years
Buildings [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			25 years
Machinery and Equipment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			10 years
Machinery and Equipment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			25 years
Other Fixed Assets [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			3 years
Other Fixed Assets [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment			25 years
Purification Solutions [Member]
Significant Accounting Policies [Line Items]
Percentage of fair value in excess of carrying amount					9.00%
Goodwill impairment charge		$ 353		353
Decrease in goodwill impairment charge during the period	$ 1
Impairment loss of indefinite lived Intangibles			$ 39
Impairment charges of definite lived Intangible assets		119
Long-lived asset impairment charge		209		209
Provision (benefit) for income taxes			$ 80	$ 80
Purification Solutions [Member] | Property, Plant and Equipment
Significant Accounting Policies [Line Items]
Long-lived asset impairment charge		$ 51