Restricted Cash, Cash Equivalents and Investments (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Restricted Cash, Cash Equivalents And Investments [Abstract]
Restricted cash and cash equivalents	$ 294	$ 277
Restricted investments, at fair value	241	254
Restricted cash, cash equivalents and investments	$ 535	$ 531

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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