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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Equity [Abstract] |  |  |  |
Unrealized translation gain (loss), before tax | $ 7 | $ 3 | $ (7) | $ (37)
Unrealized translation gain (loss), net of tax | 7 | 3 | (7) | (37)
Adjustment of unrecognized prior service cost (credit), before tax |  |  |  | (7)
Adjustment of unrecognized prior service cost (credit), tax |  |  |  | 1
Adjustment of unrecognized prior service cost (credit), net of tax |  |  |  | (6)
Total other comprehensive income (loss), before tax | 7 | 3 | (7) | (44)
Total other comprehensive income (loss), tax |  |  |  | 1
Other comprehensive income (loss) | $ 7 | $ 3 | $ (7) | $ (43)

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