Stockholders' Equity, Stock-Based Compensation and Performance Share Units Narrative (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended					0 Months Ended	3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended					12 Months Ended			6 Months Ended
	Jun. 29, 2013	Jun. 30, 2013	Jun. 30, 2013 4.50% Cumulative Comvertible Preferred Stock [Member]	Jun. 30, 2013 5.75% Cumulative Convertible Preferred Stock	Jun. 30, 2013 5.0% Cumulative Convertible Preferred Stock Series Two Thousand And Five B [Member]	Jun. 29, 2013 Restricted stock	Jun. 30, 2013 Restricted stock	Jun. 30, 2012 Restricted stock	Jun. 30, 2013 Restricted stock	Jun. 30, 2012 Restricted stock	Jun. 30, 2013 RSA [Member] Minimum Employee [Member]	Jun. 30, 2013 RSA [Member] Maximum Employee [Member]	Jun. 30, 2013 RSU [Member] Director [Member]	Jun. 30, 2013 Stock Options	Jun. 30, 2012 Stock Options	Jun. 30, 2013 Stock Options	Jun. 30, 2012 Stock Options	Jun. 30, 2013 Stock Options Management [Member]	Dec. 31, 2005 Stock Options Prior to 2006 [Member] Management [Member]	Jun. 30, 2013 Incentive Based Stock Option Award [Member] Management [Member]	Jun. 30, 2013 Retention Based Stock Option Award [Member] Management [Member]	Jun. 30, 2013 Retention Based Stock Option Award [Member] Management [Member] Stock Option Award Three Year Anniversary [Member]	Jun. 30, 2013 Retention Based Stock Option Award [Member] Management [Member] Stock Option Award Four Year Anniversary [Member]	Jun. 30, 2013 Retention Based Stock Option Award [Member] Management [Member] Stock Option Award Five Year Anniversary [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]	Jun. 30, 2013 Long-Term Incentive Plan [Member] Performance Shares [Member] Maximum Year of 2013 [Member] Management [Member]	Jun. 30, 2013 Long-Term Incentive Plan [Member] TSR [Member] Minimum Year of 2013 [Member] Management [Member]	Jun. 30, 2013 Long-Term Incentive Plan [Member] TSR [Member] Maximum Year of 2013 [Member] Management [Member]	Jun. 30, 2013 Long-Term Incentive Plan [Member] Operational Component [Member] Minimum Year of 2013 [Member] Management [Member]	Jun. 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%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized							$ 239		$ 239
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options		27
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	3 years 1 month					2 years 5 months 20 days
Recognized reductions in tax benefits							2	1	12	5				0	1	0	1
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
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage																					33.00%				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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value							$ 115		$ 115