Shareholders' Equity Shareholders' Equity Narrative (Details) (USD $)	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Shareholders' Equity [Abstract]
Preferred Stock, No Par Value	$ 0us-gaap_PreferredStockNoParValue
Common Stock, Shares Authorized	1,000,000,000us-gaap_CommonStockSharesAuthorized
Preferred Stock, Shares Authorized	500,000us-gaap_PreferredStockSharesAuthorized
Common Stock, No Par Value	$ 0us-gaap_CommonStockNoParValue
Treasury Stock, Shares	79,400,000us-gaap_TreasuryStockShares	57,500,000us-gaap_TreasuryStockShares
Treasury Stock, Value	$ 2,700,000,000us-gaap_TreasuryStockValue	$ 1,600,000,000us-gaap_TreasuryStockValue
Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax	$ (43,000,000)

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Face amount per share of no-par value common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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- Definition

Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

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-Number 210

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- Definition

Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 45

-Paragraph 20

-Subparagraph (b)

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-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

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- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

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-Publisher FASB

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-Topic 505

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