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Restructuring - Restructuring Activities Including Merak Facility Closure (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Restructuring Cost And Reserve [Line Items] |  |  |
Reserve balance | $ 22 | $ 9 | $ 9
Charges | (5) |  | 43
Cash paid | (2) |  | (9)
Reserve balance | 13 | 22 | 13
Severance and Employee Benefits [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Reserve balance | 19 | 5 | 5
Charges | 1 |  | 26
Cash paid | (9) |  | (20)
Reserve balance | 11 | 19 | 11
Asset Impairment and Accelerated Depreciation [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Charges | 1 |  | 23
Other [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Reserve balance | 1 | 2 | 2
Charges | 1 |  | 3
Cash paid | (2) |  | (5)
Reserve balance |  | 1 |
2016 Plan [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Reserve balance | 16 |  |
Charges | 3 | 48 |
Costs charged against liabilities / (assets) | (1) | (21) |
Cash paid | (9) | (11) |
Reserve balance | 9 | 16 | 9
2016 Plan [Member] | Severance and Employee Benefits [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Reserve balance | 16 |  |
Charges |  | 25 |
Costs charged against liabilities / (assets) |  | 1 |
Cash paid | (7) | (10) |
Reserve balance | 9 | 16 | $ 9
2016 Plan [Member] | Asset Impairment and Accelerated Depreciation [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Charges | 1 | 22 |
Costs charged against liabilities / (assets) | (1) | (22) |
2016 Plan [Member] | Other [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Charges | 2 | 1 |
Cash paid | $ (2) | $ (1) |

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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