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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | $ 79 | $ 57
Derivative liabilities |  | 2,829 | 2,936
Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 433 | 434
Total liabilities |  | 95 | 100
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 354 | 377
Total liabilities |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 79 | 57
Total liabilities |  | 34 | 18
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets |  | 0 | 0
Total liabilities |  | 61 | 82
Other Current Assets | Exchange Traded Funds in Fixed Income securities [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure |  | 23 |
Other Current Assets | Exchange Traded Funds in Fixed Income securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure |  | 23 |
Other Current Assets | Exchange Traded Funds in Fixed Income securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure |  | 0 |
Other Current Assets | Exchange Traded Funds in Fixed Income securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure |  | 0 |
Other Current Assets | Foreign Currency Exchange Derivatives | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 48 | 32
Other Current Assets | Foreign Currency Exchange Derivatives | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 0 | 0
Other Current Assets | Foreign Currency Exchange Derivatives | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 48 | 32
Other Current Assets | Foreign Currency Exchange Derivatives | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 0 | 0
Other Current Assets | Commodity Derivatives | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 9 | 2
Other Current Assets | Commodity Derivatives | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 0 | 0
Other Current Assets | Commodity Derivatives | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 9 | 2
Other Current Assets | Commodity Derivatives | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 0 | 0
Other Noncurrent Assets | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred Compensation Plan Assets |  | 55 | 63
Other Noncurrent Assets | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred Compensation Plan Assets |  | 55 | 63
Other Noncurrent Assets | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred Compensation Plan Assets |  | 0 | 0
Other Noncurrent Assets | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred Compensation Plan Assets |  | 0 | 0
Other Noncurrent Assets | Exchange Traded Funds in Fixed Income securities [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | [1] | 103 | 146
Other Noncurrent Assets | Exchange Traded Funds in Fixed Income securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | [1] | 103 | 146
Other Noncurrent Assets | Exchange Traded Funds in Fixed Income securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | [1] | 0 | 0
Other Noncurrent Assets | Exchange Traded Funds in Fixed Income securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | [1] | 0 | 0
Other Noncurrent Assets | Exchange traded funds in equity securities [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | [1] | 173 | 168
Other Noncurrent Assets | Exchange traded funds in equity securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | [1] | 173 | 168
Other Noncurrent Assets | Exchange traded funds in equity securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | [1] | 0 | 0
Other Noncurrent Assets | Exchange traded funds in equity securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments, Fair Value Disclosure | [1] | 0 | 0
Other Noncurrent Assets | Equity swap | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 22 | 23
Other Noncurrent Assets | Equity swap | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 0 | 0
Other Noncurrent Assets | Equity swap | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 22 | 23
Other Noncurrent Assets | Equity swap | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets |  | 0 | 0
Other Current Liabilities | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability |  | 36 | 32
Other Current Liabilities | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability |  | 0 | 0
Other Current Liabilities | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability |  | 0 | 0
Other Current Liabilities | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability |  | 36 | 32
Other Current Liabilities | Foreign Currency Exchange Derivatives | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  | 34 | 17
Other Current Liabilities | Foreign Currency Exchange Derivatives | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  | 0 | 0
Other Current Liabilities | Foreign Currency Exchange Derivatives | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  | 34 | 17
Other Current Liabilities | Foreign Currency Exchange Derivatives | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  | 0 | 0
Other Current Liabilities | Commodity Derivatives | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  |  | 1
Other Current Liabilities | Commodity Derivatives | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  |  | 0
Other Current Liabilities | Commodity Derivatives | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  |  | 1
Other Current Liabilities | Commodity Derivatives | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities |  |  | 0
Other Noncurrent Liabilities [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability |  | 25 | 50
Other Noncurrent Liabilities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability |  | 0 | 0
Other Noncurrent Liabilities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability |  | 0 | 0
Other Noncurrent Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability |  | $ 25 | $ 50
[1] | 1 Classified as restricted investments for payment of asbestos liabilities. See Note 22, "Commitments and Contingencies," of the notes to the consolidated financial statements for further details.

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