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Investments (Cash Equivalents - Narrative) (Details) (USD $) In Billions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investments [Abstract]
Cash equivalents	$ 6.3	$ 6.1

Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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