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Equity Items - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity [Abstract]        
Unrealized translation gain (loss), before tax $ (140) $ 107 $ (82) $ 15
Unrealized translation gain (loss), tax 0 (2) 0 4
Unrealized translation gain (loss), net of tax (140) 105 (82) 19
Amortization of unrecognized prior service credits included in net income, before tax 0 (1) [1] 0 (7) [1]
Amortization of unrecognized prior service credits included in net income, tax 0 1 0 3
Amortization of unrecognized prior service credits included in net income, net of tax 0 0 0 (4)
Unrealized gain on available-for-sale securities, before taxes 4 6 10 15
Unrealized gain on available-for-sale securities, tax (2) (2) (3) (4)
Unrealized gain on available-for-sale securities, net of tax 2 4 7 11
Reclassification adjustment for gains on available-for-sale securities included in net income, before tax     (4) (2)
Reclassification adjustment for gains on available-for-sale securities included in net income, tax     1 1
Reclassification adjustment for gains on available-for-sale securities included in net income, net of tax     (3) (1)
Other comprehensive income (loss), before tax (136) 112 (76) 21
Other comprehensive income (loss), tax (2) (3) (2) 4
Other comprehensive income (loss) $ (138) $ 109 $ (78) $ 25
[1] For the three and nine months ended June 30, 2017, the amortization of unrecognized prior services credits was related to pension and other postretirement benefit plans that transferred to Valvoline and was classified within the discontinued operations caption on the Statements of Consolidated Comprehensive Income (Loss).