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Fair Value Measurements Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | $ 57 | $ 87 |
Gross amount, derivative liabilities |  | 2,936 | 3,020 |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 434 | 441 |
Total liabilities |  | 100 | 10 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 377 | 354 |
Total liabilities |  | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 57 | 87 |
Total liabilities |  | 18 | 10 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 0 | 0 |
Total liabilities |  | 82 | 0 |
Fair Value, Measurements, Recurring | Other noncurrent assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred Compensation Plan Assets |  | 63 | 63 |
Fair Value, Measurements, Recurring | Other noncurrent assets | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred Compensation Plan Assets |  | 63 | 63 |
Fair Value, Measurements, Recurring | Other noncurrent assets | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred Compensation Plan Assets |  | 0 | 0 |
Fair Value, Measurements, Recurring | Other noncurrent assets | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deferred Compensation Plan Assets |  | 0 | 0 |
Fair Value, Measurements, Recurring | Other current liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 32 |  |
Fair Value, Measurements, Recurring | Other current liabilities | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 0 |  |
Fair Value, Measurements, Recurring | Other current liabilities | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 0 |  |
Fair Value, Measurements, Recurring | Other current liabilities | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 32 |  |
Fair Value, Measurements, Recurring | Other Noncurrent Liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 50 |  |
Fair Value, Measurements, Recurring | Other Noncurrent Liabilities | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 0 |  |
Fair Value, Measurements, Recurring | Other Noncurrent Liabilities | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 0 |  |
Fair Value, Measurements, Recurring | Other Noncurrent Liabilities | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 50 |  |
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other current assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] |  | 19 |
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other current assets | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] |  | 19 |
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other current assets | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] |  | 0 |
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other current assets | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] |  | 0 |
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other noncurrent assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] | 146 | 143 |
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other noncurrent assets | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] | 146 | 143 |
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other noncurrent assets | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] | 0 | 0 |
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other noncurrent assets | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] | 0 | 0 |
Fair Value, Measurements, Recurring | Equity Securities [Member] | Other noncurrent assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] | 168 | 129 |
Fair Value, Measurements, Recurring | Equity Securities [Member] | Other noncurrent assets | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] | 168 | 129 |
Fair Value, Measurements, Recurring | Equity Securities [Member] | Other noncurrent assets | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] | 0 | 0 |
Fair Value, Measurements, Recurring | Equity Securities [Member] | Other noncurrent assets | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in marketable common stock | [1] | 0 | 0 |
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | 32 | 27 |
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current assets | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | 0 | 0 |
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current assets | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | 32 | 27 |
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current assets | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | 0 | 0 |
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount, derivative liabilities |  | 17 | 10 |
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current liabilities | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount, derivative liabilities |  | 0 | 0 |
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current liabilities | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount, derivative liabilities |  | 17 | 10 |
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current liabilities | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount, derivative liabilities |  | 0 | 0 |
Fair Value, Measurements, Recurring | Commodity derivatives | Other current assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | 2 | 2 |
Fair Value, Measurements, Recurring | Commodity derivatives | Other current assets | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | 0 | 0 |
Fair Value, Measurements, Recurring | Commodity derivatives | Other current assets | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | 2 | 2 |
Fair Value, Measurements, Recurring | Commodity derivatives | Other current assets | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | 0 | 0 |
Fair Value, Measurements, Recurring | Commodity derivatives | Other current liabilities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount, derivative liabilities |  | 1 |  |
Fair Value, Measurements, Recurring | Commodity derivatives | Other current liabilities | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount, derivative liabilities |  | 0 |  |
Fair Value, Measurements, Recurring | Commodity derivatives | Other current liabilities | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount, derivative liabilities |  | 1 |  |
Fair Value, Measurements, Recurring | Commodity derivatives | Other current liabilities | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount, derivative liabilities |  | 0 |  |
Fair Value, Measurements, Recurring | Equity swap | Other noncurrent assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | 23 | 58 | [1]
Fair Value, Measurements, Recurring | Equity swap | Other noncurrent assets | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | 0 | 0 | [1]
Fair Value, Measurements, Recurring | Equity swap | Other noncurrent assets | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | 23 | 58 | [1]
Fair Value, Measurements, Recurring | Equity swap | Other noncurrent assets | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | $ 0 | $ 0 | [1]
[1] | 1 Classified as restricted investments for payment of asbestos liabilities. See Note 23, "Commitments and Contingencies" of the notes to consolidated financial statements for further details.

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