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Marketable Securities And Cash Equivalents (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 security
Marketable Securities And Cash Equivalents [Abstract]
Unrealized losses that arose within the last 12 months	$ 38
Number of available-for-sale equity securities with unrealized losses (in securities)	3
Market value of the investments that have been in an unrealized loss position for less than 12 months	$ 571

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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