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Fair Value Measurements Assets and Liabilities Measured at Fair Value (Details) - USD ($) | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount recognized, derivative assets |  | $ 97,000,000 | $ 80,000,000 |
Gross amount, derivative liabilities |  | 2,568,000,000 | 3,175,000,000 |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 441,000,000 | 464,000,000 |
Total liabilities |  | 24,000,000 | 26,000,000 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets |  | 344,000,000 | 384,000,000 |
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 |  | 97,000,000 | 80,000,000 |
Total liabilities |  | 24,000,000 | 26,000,000 |
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 |  | 0 | 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 |  | 71,000,000 | 100,000,000 |
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 |  | 71,000,000 | 100,000,000 |
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 | Assets Held for Sale, Noncurrent [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable Securities, Noncurrent |  |  | 3,000,000 |
Fair Value, Measurements, Recurring | Assets Held for Sale, Noncurrent [Member] | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable Securities, Noncurrent |  |  | 3,000,000 |
Fair Value, Measurements, Recurring | Assets Held for Sale, Noncurrent [Member] | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable Securities, Noncurrent |  |  | 0 |
Fair Value, Measurements, Recurring | Assets Held for Sale, Noncurrent [Member] | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable Securities, Noncurrent |  |  | 0 |
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] | 19,000,000 | 14,000,000 |
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] | 19,000,000 | 14,000,000 |
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 | 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 | 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] | 138,000,000 | 148,000,000 |
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] | 138,000,000 | 148,000,000 |
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] | 116,000,000 | 119,000,000 |
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] | 116,000,000 | 119,000,000 |
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 |  | 35,000,000 | 16,000,000 |
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 |  | 35,000,000 | 16,000,000 |
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 |  | 23,000,000 | 12,000,000 |
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 |  | 23,000,000 | 12,000,000 |
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 |  |  | 1,000,000 |
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 |
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 |  |  | 1,000,000 |
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 |
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 |  | 1,000,000 | 2,000,000 |
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 | 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 |  | 1,000,000 | 2,000,000 |
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 | 0 |
Fair Value, Measurements, Recurring | Commodity derivatives | Liabilities Held for Sale, Current [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount, derivative liabilities |  |  | 12,000,000 |
Fair Value, Measurements, Recurring | Commodity derivatives | Liabilities Held for Sale, Current [Member] | 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 | Liabilities Held for Sale, Current [Member] | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gross amount, derivative liabilities |  |  | 12,000,000 |
Fair Value, Measurements, Recurring | Commodity derivatives | Liabilities Held for Sale, Current [Member] | 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 |  | 62,000,000 | 63,000,000 | [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 |  | 62,000,000 | 63,000,000 | [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 22, "Commitments and Contingencies" of the notes to consolidated financial statements for further details.

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