Stockholders' Equity, Stock-Based Compensation and Performance Share Units Narrative (Details) (USD $) In Millions, unless otherwise specified				0 Months Ended	3 Months Ended		9 Months Ended					0 Months Ended	3 Months Ended		9 Months Ended			12 Months Ended	9 Months Ended						12 Months Ended				9 Months Ended
	Sep. 30, 2013 4.50% Cumulative Comvertible Preferred Stock [Member]	Sep. 30, 2013 5.75% Cumulative Convertible Preferred Stock	Sep. 30, 2013 5.0% Cumulative Convertible Preferred Stock Series Two Thousand And Five B [Member]	Sep. 29, 2013 Restricted Stock	Sep. 30, 2013 Restricted Stock	Sep. 30, 2012 Restricted Stock	Sep. 30, 2013 Restricted Stock	Sep. 30, 2012 Restricted Stock	Sep. 30, 2013 RSA [Member] Minimum Employee [Member]	Sep. 30, 2013 RSA [Member] Maximum Employee [Member]	Sep. 30, 2013 RSU [Member] Director [Member]	Sep. 29, 2013 Stock Options	Sep. 30, 2013 Stock Options	Sep. 30, 2012 Stock Options	Sep. 30, 2013 Stock Options	Sep. 30, 2012 Stock Options	Sep. 30, 2013 Stock Options Management [Member]	Dec. 31, 2005 Stock Options Prior to 2006 [Member] Management [Member]	Sep. 30, 2013 Incentive Based Stock Option Award [Member] Management [Member]	Sep. 30, 2013 Retention Based Stock Option Award [Member] Management [Member]	Sep. 30, 2013 Retention Based Stock Option Award [Member] Management [Member] Stock Option Award Three Year Anniversary [Member]	Sep. 30, 2013 Retention Based Stock Option Award [Member] Management [Member] Stock Option Award Four Year Anniversary [Member]	Sep. 30, 2013 Retention Based Stock Option Award [Member] Management [Member] Stock Option Award Five Year Anniversary [Member]	Sep. 30, 2013 Performance Shares [Member] Management [Member]	Dec. 31, 2012 Long-Term Incentive Plan [Member] Performance Shares [Member] Year of 2012 [Member] TSR is less than zero [Member]	Dec. 31, 2012 Long-Term Incentive Plan [Member] Performance Shares [Member] Year of 2012 [Member] Management [Member]	Dec. 31, 2012 Long-Term Incentive Plan [Member] Performance Shares [Member] Minimum Year of 2012 [Member] Management [Member]	Dec. 31, 2012 Long-Term Incentive Plan [Member] Performance Shares [Member] Maximum Year of 2012 [Member] Management [Member]	Sep. 30, 2013 Long-Term Incentive Plan [Member] Performance Shares [Member] Maximum Year of 2013 [Member] Management [Member]	Sep. 30, 2013 Long-Term Incentive Plan [Member] TSR [Member] Minimum Year of 2013 [Member] Management [Member]	Sep. 30, 2013 Long-Term Incentive Plan [Member] TSR [Member] Maximum Year of 2013 [Member] Management [Member]	Sep. 30, 2013 Long-Term Incentive Plan [Member] Operational Component [Member] Minimum Year of 2013 [Member] Management [Member]	Sep. 30, 2013 Long-Term Incentive Plan [Member] Operational Component [Member] Maximum Year of 2013 [Member] Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.50%	5.75%	5.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period									3 years	4 years	3 years							4 years	3 years		3 years	4 years	5 years	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value					$ 187		$ 187
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized					244		244
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition				2 years 7 months								2 years 10 months
Recognized reductions in tax benefits					0	14	12	19					2	0	2	1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage																				33.00%					100.00%	250.00%	0.00%	125.00%	200.00%	0.00%	125.00%	0.00%	62.50%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																	10 years
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options													$ 19		$ 19