Stockholders' Equity, Restricted Stock And Stock Options (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended			9 Months Ended		0 Months Ended	9 Months Ended		9 Months Ended				1 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2011 years gal	Sep. 30, 2010	Dec. 31, 2010	Sep. 30, 2011 Minimum [Member] years	Sep. 30, 2011 Maximum [Member] years	Jun. 18, 2010 5.75% Cumulative Convertible, Preferred Stock [Member]	Sep. 30, 2010 5.75% Cumulative Convertible, Preferred Stock [Member]	Jun. 30, 2010 5.75% Cumulative Convertible, Preferred Stock [Member]	Sep. 30, 2010 5.75% Cumulative Convertible, Preferred Stock (Series A) [Member]	Sep. 30, 2011 5.75% Cumulative Convertible, Preferred Stock (Series A) [Member]	Sep. 30, 2011 4.50% Cumulative Convertible Preferred Stock [Member]	Sep. 30, 2011 5.00% Cumulative Convertible Preferred Stock (Series 2005B) [Member]	May 03, 2010 5.00% Cumulative Convertible, Preferred Stock (Series 2005) [Member]	Sep. 30, 2010 5.00% Cumulative Convertible, Preferred Stock (Series 2005) [Member]	Sep. 30, 2011 Cumulative Convertible 5.75% Non-Voting Preferred Stock [Member]	Sep. 30, 2011 Unvested Restricted Stocks [Member]	Sep. 30, 2010 Unvested Restricted Stocks [Member]	Sep. 30, 2011 Unvested Restricted Stocks [Member]	Sep. 30, 2010 Unvested Restricted Stocks [Member]	Jun. 30, 2011 Unvested Stock Options [Member]	Sep. 30, 2011 Unvested Stock Options [Member]	Sep. 30, 2010 Unvested Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2.25% Contingent Convertible Senior Notes due 2038		$ 11
Maturity date		2038
Interest rate		2.25%									4.50%	5.00%			5.75%
Preferred stock dividend rate						5.75%	5.75%		5.75%				5.00%	5.00%	5.75%
Aggregate number of shares of common stock available for awards		298,500
Common stock issued, value		9
Gain (loss) on conversion/exchange of convertible senior note to common stock		(2)
Preferred stock, shares issued						900,000	1,500,000	600,000	1,100,000
Preferred stock, par value	$ 0.01		$ 0.01				$ 0.01		$ 0.01
Liquidation preference per share							$ 1,000		$ 1,000
Preferred stock, shares outstanding	7,251,515		7,254,515							3,000				5,000
Proceeds from issuance of preferred stock, net of offering costs		2,562				877	594		1,091
Convertible preferred stock, shares														20,774	111,111
Cost expected to be recognized over a weighted average period (in years)																		3
Aggregate intrinsic value of restricted stock vested	289
Unrecognized compensation cost																397		397
Recognized reduction in tax benefits																$ 7,000	$ 14,000	$ 8	$ 15	$ 1	$ 3	$ 2
Employee vesting period used for value amortization, years				4	5
Non-employee directors vesting period used for value amortization, years	3