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Fair Value Measurements Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions		Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		$ 91	$ 95
Gross amount, derivative liabilities		2,105	2,980
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		462	443
Total liabilities		47	923
Exchange traded funds in equity securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets	[1]		86
Investments in marketable common stock	[1]	100
Deferred compensation plan assets [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		92	81
Foreign currency exchange derivatives | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		27	90
Foreign currency exchange derivatives | Other current liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		46	66
Foreign currency exchange derivatives | Liabilities held for sale [Domain] | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities			5
Exchange Traded Funds in Fixed Income securities [Member] | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets	[1]	14	15
Exchange Traded Funds in Fixed Income securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	155	163
Commodity derivatives | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		9	4
Commodity derivatives | Other current liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		1
Interest rate swaps | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock			1
Available-for-sale Securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		10	3
Fixed rate debt swapped to floating | Current portion of long-term debt | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities			551
Fixed rate debt swapped to floating | Long-term debt | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities			301
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		371	348
Total liabilities		0	0
Fair Value, Inputs, Level 1 | Exchange traded funds in equity securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets	[1]		86
Investments in marketable common stock	[1]	100
Fair Value, Inputs, Level 1 | Deferred compensation plan assets [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		92
Fair Value, Inputs, Level 1 | Foreign currency exchange derivatives | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		0	0
Fair Value, Inputs, Level 1 | Foreign currency exchange derivatives | Other current liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		0	0
Fair Value, Inputs, Level 1 | Foreign currency exchange derivatives | Liabilities held for sale [Domain] | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities			0
Fair Value, Inputs, Level 1 | Exchange Traded Funds in Fixed Income securities [Member] | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets	[1]	14	15
Fair Value, Inputs, Level 1 | Exchange Traded Funds in Fixed Income securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	155	163
Fair Value, Inputs, Level 1 | Commodity derivatives | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		0	0
Fair Value, Inputs, Level 1 | Commodity derivatives | Other current liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		0
Fair Value, Inputs, Level 1 | Interest rate swaps | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock			0
Fair Value, Inputs, Level 1 | Available-for-sale Securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		10	3
Fair Value, Inputs, Level 1 | Fixed rate debt swapped to floating | Current portion of long-term debt | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities			0
Fair Value, Inputs, Level 1 | Fixed rate debt swapped to floating | Long-term debt | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities			0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		91	95
Total liabilities		47	923
Significant Other Observable Inputs (Level 2) | Exchange traded funds in equity securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets	[1]		0
Investments in marketable common stock	[1]	0
Significant Other Observable Inputs (Level 2) | Deferred compensation plan assets [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		0	0
Significant Other Observable Inputs (Level 2) | Foreign currency exchange derivatives | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		27	90
Significant Other Observable Inputs (Level 2) | Foreign currency exchange derivatives | Other current liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		46	66
Significant Other Observable Inputs (Level 2) | Foreign currency exchange derivatives | Liabilities held for sale [Domain] | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities			5
Significant Other Observable Inputs (Level 2) | Exchange Traded Funds in Fixed Income securities [Member] | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets	[1]	0	0
Significant Other Observable Inputs (Level 2) | Exchange Traded Funds in Fixed Income securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	0	0
Significant Other Observable Inputs (Level 2) | Commodity derivatives | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		9	4
Significant Other Observable Inputs (Level 2) | Commodity derivatives | Other current liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		1
Significant Other Observable Inputs (Level 2) | Interest rate swaps | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock			1
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		0	0
Significant Other Observable Inputs (Level 2) | Fixed rate debt swapped to floating | Current portion of long-term debt | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities			551
Significant Other Observable Inputs (Level 2) | Fixed rate debt swapped to floating | Long-term debt | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities			301
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		0	0
Total liabilities		0	0
Significant Unobservable Inputs (Level 3) | Exchange traded funds in equity securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets	[1]		0
Investments in marketable common stock	[1]	0
Significant Unobservable Inputs (Level 3) | Deferred compensation plan assets [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		0	0
Significant Unobservable Inputs (Level 3) | Foreign currency exchange derivatives | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		0	0
Significant Unobservable Inputs (Level 3) | Foreign currency exchange derivatives | Other current liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		0	0
Significant Unobservable Inputs (Level 3) | Foreign currency exchange derivatives | Liabilities held for sale [Domain] | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities			0
Significant Unobservable Inputs (Level 3) | Exchange Traded Funds in Fixed Income securities [Member] | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets	[1]	0	0
Significant Unobservable Inputs (Level 3) | Exchange Traded Funds in Fixed Income securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	0	0
Significant Unobservable Inputs (Level 3) | Commodity derivatives | Other current assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		0	0
Significant Unobservable Inputs (Level 3) | Commodity derivatives | Other current liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		0
Significant Unobservable Inputs (Level 3) | Interest rate swaps | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock			0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities [Member] | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		0	0
Significant Unobservable Inputs (Level 3) | Fixed rate debt swapped to floating | Current portion of long-term debt | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities			$ 0
Equity swap | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		55
Equity swap | Fair Value, Inputs, Level 1 | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		0
Equity swap | Significant Other Observable Inputs (Level 2) | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		55
Equity swap | Significant Unobservable Inputs (Level 3) | Other noncurrent assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock		$ 0
[1] 1Classified 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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