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Derivative Instruments and Hedging Activities - Location and Fair Values of Derivative Instruments and Hedging Activities (Detail) € in Millions, shares in Millions, $ in Millions, ¥ in Billions | 6 Months Ended |  |
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Mar. 31, 2019 USD ($) T shares | Mar. 31, 2019 EUR (€) T shares | Mar. 31, 2019 JPY (¥) T shares | Sep. 30, 2018 USD ($) T Swap shares | Sep. 30, 2018 EUR (€) T Swap shares | Sep. 30, 2018 JPY (¥) T Swap shares
Derivative Instruments [Line Items] |  |  |  |  |  |
Hedge Percentage For Foreign Exchange Transactional Exposures Minimum | 70.00% |  |  |  |  |
Hedge Percentage For Foreign Exchange Transactional Exposures Maximum | 90.00% |  |  |  |  |
Number of Interest Rate Derivatives Held | Swap |  |  |  | 0 | 0 | 0
Derivative, amount of hedged ordinary shares | shares | 1.6 | 1.6 | 1.6 | 1.8 | 1.8 | 1.8
Derivative assets | $ 88 |  |  | $ 80 |  |
Derivative liabilities | $ 3,085 |  |  | $ 3,175 |  |
Copper [Member] |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 3,071 | 3,071 | 3,071 | 3,175 | 3,175 | 3,175
Polypropylene [Member] |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 12,392 | 12,392 | 12,392 | 15,868 | 15,868 | 15,868
Lead [Member] |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 4,500 | 4,500 | 4,500 | 49,066 | 49,066 | 49,066
Aluminum [Member] |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 2,637 | 2,637 | 2,637 | 3,381 | 3,381 | 3,381
Tin [Member] |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 1,594 | 1,594 | 1,594 | 3,076 | 3,076 | 3,076
Equity swap |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative, Amount of Hedged Item | $ 66 |  |  | $ 73 |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Notional amount | ¥ |  |  | ¥ 35 |  |  | ¥ 35
Liabilities Held for Sale, Current [Member] | Commodity Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative liabilities | 8 |  |  |  |  |
Designated as Hedging Instrument |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative assets | 17 |  |  | 7 |  |
Derivative liabilities | 3,080 |  |  | 3,173 |  |
Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative assets | 9 |  |  | 6 |  |
Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative assets | 1 |  |  | 1 |  |
Designated as Hedging Instrument | Assets Held for Sale, Current [Member] | Commodity Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative assets | 7 |  |  | 0 |  |
Designated as Hedging Instrument | Other Noncurrent Assets | Equity swap |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative assets | 0 |  |  | 0 |  |
Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative liabilities | 7 |  |  | 10 |  |
Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative liabilities | 0 |  |  | 2 |  |
Designated as Hedging Instrument | Liabilities Held for Sale, Current [Member] | Commodity Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative liabilities | 8 |  |  | 12 |  |
Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative liabilities | 3,065 |  |  | 3,149 |  |
Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative assets | 71 |  |  | 73 |  |
Derivative liabilities | 5 |  |  | 2 |  |
Not Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative assets | 12 |  |  | 10 |  |
Not Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative assets | 0 |  |  | 0 |  |
Not Designated as Hedging Instrument | Assets Held for Sale, Current [Member] | Commodity Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative assets | 0 |  |  | 0 |  |
Not Designated as Hedging Instrument | Other Noncurrent Assets | Equity swap |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative assets | 59 |  |  | 63 |  |
Not Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative liabilities | 5 |  |  | 2 |  |
Not Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative liabilities | 0 |  |  | 0 |  |
Not Designated as Hedging Instrument | Liabilities Held for Sale, Current [Member] | Commodity Derivatives |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative liabilities | 0 |  |  | 0 |  |
Not Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Derivative liabilities | $ 0 |  |  | $ 0 |  |
One billion euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Notional amount | € |  | € 1,000,000,000,000 |  |  | € 1,000,000,000,000 |
423 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Notional amount | € |  | 423 |  |  | 423 |
58 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |
Notional amount | € |  | € 58 |  |  | € 58 |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + 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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