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Debt and Other Obligations Debt Securities Activity (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended					1 Months Ended		1 Months Ended				3 Months Ended			9 Months Ended	1 Months Ended		3 Months Ended		9 Months Ended
	May 31, 2012 2009 Series A	Nov. 30, 2011 2009 Series A	Jun. 30, 2012 2009 Series B	Dec. 31, 2011 2009 Series B	Dec. 01, 2011 2009 Series B	Apr. 30, 2012 1992 Series D	Apr. 15, 2012 1992 Series D	May 31, 2012 1999 Series A	May 31, 2012 2000 Series F	May 31, 2012 2002 Series A	Jun. 30, 2012 1998 Series D	Jun. 30, 2012 Electronotes	Mar. 31, 2012 Electronotes	Dec. 31, 2011 Electronotes	Jun. 30, 2012 Total	Jan. 31, 2012 Debt of variable interest entities	Jan. 17, 2012 Debt of variable interest entities	Jun. 30, 2012 Electronotes	Mar. 31, 2012 Electronotes	Jun. 30, 2012 Total
Debt Instrument
Amount	$ 2	$ 2	$ 1	$ 1		$ 1,000		$ 2	$ 29	$ 1,486	$ 5	$ 40	$ 106	$ 16	$ 2,690	$ 1,000		$ 66	$ 69	$ 1,135
Interest rate	2.25%	2.25%	3.77%		3.77%		8.25%	4.50%	7.14%	6.79%	4.73%	4.04%	4.50%	4.82%			4.87%	3.48%	3.42%

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	na
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X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Balance Type:	debit
Period Type:	duration