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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 | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) T Swap shares | Dec. 31, 2016 | Mar. 31, 2018 USD ($) T Swap | Sep. 30, 2017 USD ($) T Swap shares | Mar. 31, 2018 EUR (€) T Swap | Mar. 31, 2018 JPY (¥) T Swap | Sep. 30, 2017 EUR (€) T Swap | Sep. 30, 2017 JPY (¥) T Swap | Sep. 30, 2016 USD ($) Swap
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 | 0 | 0 | 0 | 0 |
Number of interest rate derivatives terminated |  | 4 |  |  |  |  |  |  |
Derivative, amount of hedged ordinary shares | shares | 1.8 |  |  | 1.4 |  |  |  |  |
Derivative assets | $ 92 |  | $ 92 | $ 91 |  |  |  |  |
Derivative liabilities | $ 3,120 |  | $ 3,120 | $ 2,105 |  |  |  |  |
Copper [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 3,901 |  | 3,901 | 1,962 | 3,901 | 3,901 | 1,962 | 1,962 |
Polypropylene [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 16,561 |  | 16,561 | 19,563 | 16,561 | 16,561 | 19,563 | 19,563 |
Lead [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 6,500 |  | 6,500 | 24,705 | 6,500 | 6,500 | 24,705 | 24,705 |
Aluminum [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 4,525 |  | 4,525 | 2,169 | 4,525 | 4,525 | 2,169 | 2,169 |
Tin [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 2,015 |  | 2,015 | 1,715 | 2,015 | 2,015 | 1,715 | 1,715 |
Equity swap |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Amount of Hedged Item | $ 73 |  | $ 73 | $ 58 |  |  |  |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | ¥ |  |  |  |  |  | ¥ 35 |  | ¥ 35 |
Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 29 |  | 29 | 36 |  |  |  |  |
Derivative liabilities | 3,098 |  | 3,098 | 2,080 |  |  |  |  |
Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 26 |  | 26 | 27 |  |  |  |  |
Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 3 |  | 3 | 9 |  |  |  |  |
Designated as Hedging Instrument | Other Noncurrent Assets | Equity swap |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 0 |  | 0 | 0 |  |  |  |  |
Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative liabilities | 15 |  | 15 | 21 |  |  |  |  |
Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative liabilities | 2 |  | 2 | 1 |  |  |  |  |
Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative liabilities | 3,081 |  | 3,081 | 2,058 |  |  |  |  |
Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 63 |  | 63 | 55 |  |  |  |  |
Derivative liabilities | 22 |  | 22 | 25 |  |  |  |  |
Not Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 0 |  | 0 | 0 |  |  |  |  |
Not Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 0 |  | 0 | 0 |  |  |  |  |
Not Designated as Hedging Instrument | Other Noncurrent Assets | Equity swap |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 63 |  | 63 | 55 |  |  |  |  |
Not Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative liabilities | 22 |  | 22 | 25 |  |  |  |  |
Not Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative liabilities | 0 |  | 0 | 0 |  |  |  |  |
Not Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative liabilities | $ 0 |  | $ 0 | $ 0 |  |  |  |  |
One Point Four Percent Due Two Thousand Eighteen | Interest Rate Swaps |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Number of Interest Rate Derivatives Held | Swap |  |  |  |  |  |  |  |  | 3
Notional amount |  |  |  |  |  |  |  |  | $ 300
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 1.40%
2.6% due 2017 | Interest Rate Swaps |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Number of Interest Rate Derivatives Held | Swap |  |  |  |  |  |  |  |  | 4
Notional amount |  |  |  |  |  |  |  |  | $ 400
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 2.60%
7.125% due 2017 | Interest Rate Swaps |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Number of Interest Rate Derivatives Held | Swap |  |  |  |  |  |  |  |  | 1
Notional amount |  |  |  |  |  |  |  |  | $ 150
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 7.125%
One billion euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  | € 1,000 |  | € 1,000 |  |
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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