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Derivative Instruments and Hedging Activities - Additional Information (Detail) € in Millions, shares in Millions, ¥ in Billions | 3 Months Ended | 9 Months Ended |  |  |
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Jun. 30, 2017 USD ($) Swap shares | Jun. 30, 2016 USD ($) | Sep. 30, 2005 USD ($) Agreement | Jun. 30, 2017 USD ($) Swap | Jun. 30, 2016 USD ($) | Jun. 30, 2017 EUR (€) Swap | Sep. 30, 2016 USD ($) Swap | Sep. 30, 2016 EUR (€) Swap | Sep. 30, 2016 JPY (¥) Swap | Mar. 31, 2006 Agreement
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Hedge percentage for foreign exchange transactional exposures, Minimum |  |  |  | 70.00% |  |  |  |  |  |
Hedge percentage for foreign exchange transactional exposures, Maximum |  |  |  | 90.00% |  |  |  |  |  |
Number of fixed to floating interest rate swaps outstanding | Swap | 0 |  |  | 0 |  | 0 | 8 | 8 | 8 |
Derivative, amount of hedged ordinary shares | shares | 1.4 |  |  |  |  |  |  |  |  |
Number of forward treasury lock agreements | Agreement |  |  | 3 |  |  |  |  |  |  |
Types Of Notes Forward Treasury Lock Agreements Fixed Portion Of Future Interest Cost |  |  | 5-year, 10-year and 30-year notes |  |  |  |  |  |  |
Number of forward treasury lock agreements terminated | Agreement |  |  |  |  |  |  |  |  |  | 3
Collateral posted | $ 0 |  |  | $ 0 |  |  | $ 0 |  |  |
Gains (losses) reclassified from CTA to income for the Company's outstanding net investment hedges | 0 | $ 0 |  | 0 | $ 0 |  |  |  |  |
Gains (losses) recognized in income for the ineffective portion of cash flow hedges | 0 | 0 |  | 0 | 0 |  |  |  |  |
Equity swap |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Amount of Hedged Item |  |  |  |  |  |  | $ 0 |  |  |
Treasury Lock |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | $ 1,300,000,000 |  |  |  |  |  |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | ¥ |  |  |  |  |  |  |  |  | ¥ 37 |
One billion euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  | € 1,000 |  | € 1,000 |  |
500 million euro net investment hedge [Member] [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  | € 485 |  | € 500 |  |
Net Investment Hedging [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | $ (105,000,000) | $ (36,000,000) |  | $ (77,000,000) | $ (62,000,000) |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Gains (losses) reclassified from CTA to income for the Company's outstanding net investment hedges + References No definition available. + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624258-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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