Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13,16)

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- 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

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-Number 210

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-Article 5

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

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-Topic 210

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

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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

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-Topic 210

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- Definition

Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.

+ 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)

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

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 SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

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Debt (Schedule Of Outstanding Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Current portion of long-term debt	$ 260		$ 260
Long-term Debt and Capital Lease Obligations	2,658		2,668
Long-term debt, current and noncurrent	2,918		2,928
Senior Debt Obligations Due 2012 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	0		250
Debt instrument, interest rate, effective percentage	5.10%
Debt instrument, interest rate, stated percentage	6.25%
Senior Debt Obligations Due 2013 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	250		251
Debt instrument, interest rate, stated percentage	4.85%
Senior Debt Obligations Due 2033 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	296		296
Debt instrument, interest rate, stated percentage	5.875%
Senior Debt Obligations Due 2014 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	326		326
Debt instrument, interest rate, stated percentage	5.375%
Senior Debt Obligations Due 2015 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	479		479
Debt instrument, interest rate, stated percentage	5.75%
Senior Debt Obligations Due 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	398		398
Debt instrument, interest rate, stated percentage	9.25%
Senior Debt Obligations Due 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	497		496
Debt instrument, interest rate, stated percentage	4.80%
Mortgage Due 2035 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	422		431
Debt instrument, interest rate, stated percentage	5.70%
Other [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	1		1
Senior Debt Obligations Due 2017 [Member]
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations	$ 249		$ 0
Debt instrument, interest rate, stated percentage		2.30%