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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 | 9 Months Ended | 12 Months Ended |  |  |
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Jun. 30, 2018 USD ($) T Swap shares | Dec. 31, 2016 | Jun. 30, 2018 USD ($) T Swap | Sep. 30, 2017 USD ($) T Swap shares | Jun. 30, 2018 EUR (€) T Swap | Jun. 30, 2018 JPY (¥) T Swap | Sep. 30, 2017 EUR (€) T Swap | Sep. 30, 2017 JPY (¥) T Swap | Sep. 30, 2016 USD ($) 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 | $ 81 |  | $ 81 | $ 91 |  |  |  |  |
Derivative liabilities | $ 2,948 |  | $ 2,948 | $ 2,105 |  |  |  |  |
Copper [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 2,948 |  | 2,948 | 1,962 | 2,948 | 2,948 | 1,962 | 1,962 |
Polypropylene [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 8,540 |  | 8,540 | 19,563 | 8,540 | 8,540 | 19,563 | 19,563 |
Lead [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 31,009 |  | 31,009 | 24,705 | 31,009 | 31,009 | 24,705 | 24,705 |
Aluminum [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 3,885 |  | 3,885 | 2,169 | 3,885 | 3,885 | 2,169 | 2,169 |
Tin [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 2,276 |  | 2,276 | 1,715 | 2,276 | 2,276 | 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 | 10 |  | 10 | 36 |  |  |  |  |
Derivative liabilities | 2,926 |  | 2,926 | 2,080 |  |  |  |  |
Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 8 |  | 8 | 27 |  |  |  |  |
Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 2 |  | 2 | 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 | 7 |  | 7 | 21 |  |  |  |  |
Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative liabilities | 3 |  | 3 | 1 |  |  |  |  |
Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative liabilities | 2,916 |  | 2,916 | 2,058 |  |  |  |  |
Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 71 |  | 71 | 55 |  |  |  |  |
Derivative liabilities | 22 |  | 22 | 25 |  |  |  |  |
Not Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives |  |  |  |  |  |  |  |  |
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative assets | 11 |  | 11 | 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 | 60 |  | 60 | 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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