Debt (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Long-term Debt, by Maturity [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 880
Long-term Debt, Maturities, Repayments of Principal in Year Two	1,838
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,568
Long-term Debt, Maturities, Repayments of Principal in Year Four	2,305
Long-term Debt, Maturities, Repayments of Principal in Year Five	1,425
Long-term Debt, Maturities, Repayments of Principal after Year Five	6,723
Long-term Debt, Gross	14,739	15,442
Debt Instrument, Amortization Discount (Premium), Net Year One	(103)
Debt Instrument, Amortization Discount (Premium), Net Year Two	(203)
Debt Instrument, Amortization Discount (Premium), Net Year Three	(166)
Debt Instrument, Amortization Discount (Premium), Net Year Four	(111)
Debt Instrument, Amortization Discount (Premium), Net Year Five	(76)
Debt Instrument, Amortization Discount (Premium), Net After Year Five	(188)
Debt Instrument, Unamortized Discount (Premium), Net	(847)	(935)
Net carrying amount	$ 13,892	$ 14,507

Amortization of debt discount net after year five.

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Amortization of debt discount net year five.

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Amortization of debt discount net year four.

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Amortization of debt discount, net year one.

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Amortization of debt discount net year three.

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Amortization of debt discount, net year two.

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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

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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.

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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.

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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

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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.

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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.

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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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