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Accumulated Other Comprehensive Income (Loss) - Amounts Reclassified Out of AOCI (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Total after tax | $ (1) | $ (1) | $ (1) |  |  |
(Gains) Losses Reclassified to Interest Expense [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Total before tax | (2) |  |  |  | $ (4) |
Amortization of Actuarial Losses [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Total before tax | 1 |  |  | $ 1 | 2 | $ 4
Amortization of Prior Service Credit [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Total before tax | (1) |  |  | $ (1) | (2) | (2)
Pension and Other Postretirement Benefit Liability Adjustments [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Total before tax | (2) |  |  |  | (4) | 2
Tax impact | 1 |  |  |  | 1 |
Total after tax | $ (1) |  |  |  | $ (3) | $ 2

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