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Financial Information by Segment & Geographic Area - Schedule of Income (Loss) from Continuing Operations before Income Taxes and Equity in Earnings of Affiliated Companies for Unallocated and Other (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]      
Interest expense $ (49) $ (53) $ (59)
Global restructuring activities (11) (19) (16)
Unallocated and Other [Member]      
Segment Reporting Information [Line Items]      
Interest expense (49) (53) (59)
Unallocated corporate costs (58) (41) (50)
General unallocated income (expense)   (1) 8
Less: Equity in earnings of affiliated companies, net of tax 3 3 1
Income from continuing operations before income taxes and equity in earnings of affiliated companies (144) (316) (189)
Certain Items [Member]      
Segment Reporting Information [Line Items]      
Indirect tax settlement credits 12 3  
Legal and environmental matters and reserves (25) (54) (21)
Global restructuring activities (11) (19) (16)
Acquisition and integration-related charges (5) (5) (6)
Employee benefit plan settlement and other charges (4) (10) 1
Inventory reserve adjustment   (2)  
Executive transition costs     (1)
Other certain items (1) (1) (4)
Total certain items, pre-tax $ (34) (218) (87)
Certain Items [Member] | Marshall Mine [Member]      
Segment Reporting Information [Line Items]      
Loss on sale and asset impairment charge   (129)  
Certain Items [Member] | Specialty Fluids [Member]      
Segment Reporting Information [Line Items]      
Loss on sale and asset impairment charge   $ (1) (29)
Certain Items [Member] | Equity Affiliate Investment [Member]      
Segment Reporting Information [Line Items]      
Investment impairment charge     $ (11)