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Discontinued Operations - Reconciliation of Consolidated Income (Loss) From Discontinued Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income(loss) from discontinued operations attributable to Composites/Marl facility disposal group      
Pretax income of discontinued operations $ 558 $ 105 $ 303
Income from discontinued operations 481 95 208
Composites/Marl facility [Member]      
Income(loss) from discontinued operations attributable to Composites/Marl facility disposal group      
Sales 1,012 1,154 951
Cost of sales (785) (942) (783)
Selling, general and administrative expense (74) (79) (65)
Research and development expense (11) (12) (10)
Equity and other income 3 4 4
Pretax operating income of discontinued operations 145 125 97
Net interest and other financing expense (21) (20) (5)
Other net periodic benefit income (costs) (6) (2) 2
Net gain on acquisitions and divestitures     4
Pretax income of discontinued operations 118 103 98
Benefit (expense) related to income (loss) from discontinued operations (24) (17) (23)
Income from discontinued operations $ 94 86 75
Valvoline [Member]      
Income(loss) from discontinued operations attributable to Composites/Marl facility disposal group      
Sales [1]     1,237
Cost of sales [1]     (750)
Selling, general and administrative expense [1]     (234)
Research and development expense [1]     (8)
Equity and other income [1]     17
Pretax operating income of discontinued operations [1]     262
Net interest and other financing expense [1]     (22)
Pretax income of discontinued operations   $ (1) 240 [1]
Benefit (expense) related to income (loss) from discontinued operations [1]     (81)
Income from discontinued operations [1]     $ 159
[1] Results in 2017 reflect activity through May 12, 2017 when Valvoline was fully separated, as previously discussed.