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Fair Value Measurements Fair Value Disclosure, Additional Information (Details) € in Millions, $ in Millions, ¥ in Billions	12 Months Ended
	Sep. 30, 2017 USD ($) Swap	Sep. 30, 2016 USD ($) Swap	Sep. 30, 2017 EUR (€) Swap	Sep. 30, 2017 JPY (¥) Swap	Sep. 30, 2016 EUR (€) Swap	Sep. 30, 2016 JPY (¥) Swap	Jun. 30, 2014 USD ($) Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Gross Unrealized Gain	$ 5
Net Realized and Unrealized Gain (Loss) on Trading Securities		$ 1
Number of fixed to floating interest rate swaps outstanding | Swap	0	8	0	0	8	8
Debt Instrument, Fair Value Disclosure	$ 12,700	$ 15,700
Foreign Currency Denominated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount | ¥				¥ 35		¥ 37
Interest rate swaps | Two Point Six Percent Due Two Thousand Seventeen
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Amount of Hedged Item							$ 400
Debt Instrument, Interest Rate, Stated Percentage							2.60%
Number of fixed to floating interest rate swaps outstanding | Swap							4
Interest rate swaps | 1.4% Due in 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Amount of Hedged Item							$ 300
Debt Instrument, Interest Rate, Stated Percentage							1.40%
Number of fixed to floating interest rate swaps outstanding | Swap							3
Interest rate swaps | 7.125 % Due in 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Amount of Hedged Item							$ 150
Debt Instrument, Interest Rate, Stated Percentage							7.125%
Number of fixed to floating interest rate swaps outstanding | Swap							1
One billion euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount | €			€ 1,000		€ 1,000
500 million euro net investment hedge [Member] [Member] | Foreign Currency Denominated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount | €					€ 500
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	4,100	6,000
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	$ 8,600	$ 9,700

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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