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Fair Value (Details 8) (Variable interest entities, USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Variable interest entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contractual principal balance	$ 2,624	$ 2,954
Difference between estimated fair value and contractual principal balance	109	114
Carrying value at estimated fair value	$ 2,733	$ 3,068

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.

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