Available-For-Sale Investments (Summary Of Fair Value Of Available-For-Sale Investments) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
U.S. Government and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,733	$ 1,734
Fair value	1,737	1,737
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	61	64
Fair value	41	45
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5	11
Fair value	11	15
Long Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	61	64
Fair value	41	45
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,738	1,745
Fair value	$ 1,748	$ 1,752

- Definition

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading. Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

+ References+ Details