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Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of AOCI, Net of Tax (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance |  |  | $ 1,625 | $ 1,625 |
Other comprehensive income (loss) before reclassifications | $ (110) | $ 59 |  |  |
Amounts reclassified from AOCI | (1) | (1) | (1) |  |
Less: Other comprehensive income (loss) attributable to noncontrolling interests | (7) | 4 | 3 |  |
Ending Balance | 1,289 |  |  | 1,289 |
Currency Translation Adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance | (154) | (208) | (204) | (204) |
Other comprehensive income (loss) before reclassifications | (109) | 59 |  |  |
Amounts reclassified from AOCI | (1) | (1) | (1) |  |
Less: Other comprehensive income (loss) attributable to noncontrolling interests | (7) | 4 | 3 |  |
Ending Balance | (257) | (154) | (208) | (257) |
Unrealized Gains on Investments [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance | 2 | 2 | 2 | 2 |
Other comprehensive income (loss) before reclassifications | (1) |  |  |  |
Ending Balance | 1 | 2 | 2 | 1 |
Pension and Other Postretirement Benefit Liability Adjustments [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance | (57) | (57) | (57) | (57) |
Amounts reclassified from AOCI | (1) |  |  | (3) | $ 2
Ending Balance | (57) | (57) | (57) | (57) |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance | (209) | (263) | (259) | (259) |
Ending Balance | $ (313) | $ (209) | $ (263) | $ (313) |

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