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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]
 1Classified as restricted investments for payment of asbestos liabilities. See Note 22, "Commitments and Contingencies" of the notes to consolidated financial statements for further details.