Debt (Details 1) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2011	Dec. 31, 2010
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Carrying Value of Notes and debentures:	$ 3,139	$ 1,328
Fair Value of Notes and debentures:	3,360	1,483
4.90% Notes and Debentures due May 2014 [Member]
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Maturity Date of Notes and debentures:	May 2014
Interest Rate of Notes and debentures:	4.90%
Carrying Value of Notes and debentures:	500	500
Fair Value of Notes and debentures:	534	538
3.55% Notes and Debentures due September 2016 [Member]
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Maturity Date of Notes and debentures:	September 2016
Interest Rate of Notes and debentures:	3.55%
Carrying Value of Notes and debentures:	600	0
Fair Value of Notes and debentures:	611	0
4.25% Notes and Debentures due October 2016 [Member]
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Maturity Date of Notes and debentures:	October 2016
Interest Rate of Notes and debentures:	4.25%
Carrying Value of Notes and debentures:	250	0
Fair Value of Notes and debentures:	254	0
6.125% Notes and Debentures due May 2019 [Member]
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Maturity Date of Notes and debentures:	May 2019
Interest Rate of Notes and debentures:	6.125%
Carrying Value of Notes and debentures:	500	500
Fair Value of Notes and debentures:	572	553
4.875% Notes and Debentures due October 2021 [Member]
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Maturity Date of Notes and debentures:	October 2021
Interest Rate of Notes and debentures:	4.875%
Carrying Value of Notes and debentures:	600	0
Fair Value of Notes and debentures:	604	0
5.55% Notes and Debentures due October 2021
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Maturity Date of Notes and debentures:	October 2021
Interest Rate of Notes and debentures:	5.55%
Carrying Value of Notes and debentures:	400	0
Fair Value of Notes and debentures:	406	0
7.40% Notes and Debentures due November 2025 [Member]
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Maturity Date of Notes and debentures:	November 2025
Interest Rate of Notes and debentures:	7.40%
Carrying Value of Notes and debentures:	250	250
Fair Value of Notes and debentures:	338	311
Notes and Debentured due August 2048 [Member]
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Maturity Date of Notes and debentures:	August 2048
Carrying Value of Notes and debentures:	1	1
Fair Value of Notes and debentures:	1	1
4.70% Notes and Debentures December 2010 - 2014 [Member]
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Maturity Date of Notes and debentures:	December 2010 – 2014
Interest Rate of Notes and debentures:	4.70%
Carrying Value of Notes and debentures:	0	66
Fair Value of Notes and debentures:	0	69
Notes and Debentures Various 2011 - 2022 [Member]
Carrying and Fair Value of Long Term Outstanding Notes and Debentures by Maturity
Maturity Date of Notes and debentures:	Various 2011 – 2022
Carrying Value of Notes and debentures:	38	11
Fair Value of Notes and debentures:	$ 40	$ 11

Carrying and fair value of long term outstanding notes and debentures by maturity.

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ 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 210.5-02.22)

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-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 31

-Subparagraph b

-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.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13476-108611

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-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.

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)(2))

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

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