Long Term Debt (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 1,925
Debt Instrument, Amortization Discount (Premium), Net Year One	(199)
Long-term Debt, Maturities, Repayments of Principal in Year Two	1,558
Debt Instrument, Amortization Discount (Premium), Net Year Two	(157)
Long-term Debt, Maturities, Repayments of Principal in Year Three	2,286
Debt Instrument, Amortization Discount (Premium), Net Year Three	(104)
Long-term Debt, Maturities, Repayments of Principal in Year Four	1,347
Debt Instrument, Amortization Discount (Premium), Net Year Four	(75)
Long-term Debt, Maturities, Repayments of Principal in Year Five	1,240
Debt Instrument, Amortization Discount (Premium), Net Year Five	(66)
Long-term Debt, Maturities, Repayments of Principal after Year Five	5,441
Debt Instrument, Amortization Discount (Premium), Net After Year Five	(136)
Long-term Debt, Gross	13,797	15,442
Debt Instrument, Unamortized Discount (Premium), Net	(737)	(935)
Long-term Debt	$ 13,060	$ 14,507

Amortization of debt discount net after year five.

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- Definition

Amortization of debt discount net year five.

+ References

No definition available.

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- Definition

Amortization of debt discount net year four.

+ References

No definition available.

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- Definition

Amortization of debt discount, net year one.

+ References

No definition available.

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- Definition

Amortization of debt discount net year three.

+ References

No definition available.

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Amortization of debt discount, net year two.

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No definition available.

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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

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- Definition

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any.

+ 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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- Definition

Amount of long-term debt maturities after year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

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- Definition

Amount of long-term debt maturing within the next twelve months following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

+ References

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Amount of long-term debt maturing in year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

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Amount of long-term debt maturing in year two following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

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