Fair Value of Financial Investments and Liabilities (Details Textual) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investment Holdings [Line Items]
Asset Impairment Charges		$ 0	$ (34,000,000)	$ (10,000,000)
Fair Value of Financial Investments and Liabilities (Textual) [Abstract]
Venture capital fund, aggregate carrying value		17,000,000
Number of venture capital fund		17
Buy out fund, aggregate carrying value		69,000,000
Number of buy out fund		22
Auction rate securities interest rates reset periods		7, 28 or 35 days
Impairment loss on fair value of marketable securities	28,000,000
Reversal of unrealized gain from accumulated other comprehensive income	23,000,000
Cash proceeds from marketable securities			11,000,000
Realized losses from marketable securities			8,000,000
Tax Refund Receivable in next year relating to sale of marketable securities		16,000,000
Sale of financial investments, shares		1,974,000	481,000
Sale of financial investments		43,000,000	10,000,000
Aggregate carrying value of remaining private equity funds		0	104,000,000
Impairment charges for financial investments		0	34,000,000	10,000,000
Estimated market value of long-term and short-term debt		4,000,000,000	4,200,000,000
Aggregate carrying value of long-term and short-term debt		4,000,000,000	4,100,000,000
Private Equity Funds [Member]
Investment Holdings [Line Items]
Asset Impairment Charges			(4,000,000)	(10,000,000)
Carrying value of financial asset			6,000,000	41,000,000
Fair Value of Financial Investments and Liabilities (Textual) [Abstract]
Impairment charges for financial investments			4,000,000	10,000,000
Other Investment [Member]
Investment Holdings [Line Items]
Asset Impairment Charges			2,000,000
Fair Value of Financial Investments and Liabilities (Textual) [Abstract]
Impairment charges for financial investments			$ (2,000,000)