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Collateral Financing Arrangements (Details) (Secured Debt [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Collateral Financing Arrangements (Textuals) [Abstract]
Partial repurchase	$ 451
MRC [Member]
Collateral Financing Arrangements (Textuals) [Abstract]
Debt Instrument, Issuance Date	December 2007
Debt Instrument, Principal Outstanding	$ 1,400	$ 1,900

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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