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Derivative Instruments and Hedging Activities - Additional Information (Detail) € in Millions, ¥ in Billions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2019 EUR (€) | Mar. 31, 2019 JPY (¥) | Sep. 30, 2018 EUR (€) | Sep. 30, 2018 JPY (¥)
Derivative [Line Items] |  |  |  |  |  |  |  |
Gains (losses) reclassified from CTA to income for the Company's outstanding net investment hedges | $ | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | ¥ |  |  |  |  |  | ¥ 35 |  | ¥ 35
58 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | € 58 |  | € 58 |
215 million EUR maturing in March 2020 [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 215 |  | 215 |
One billion euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 1,000,000,000,000 |  | 1,000,000,000,000 |
750 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 750 |  | 750 |
423 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | € 423 |  | € 423 |
Net Investment Hedging [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | $ | $ 50,000,000 | $ (100,000,000) | $ 84,000,000 | $ (136,000,000) |  |  |  |

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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 Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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