Stockholders' Equity, Performance Shares Table (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Long-Term Incentive Plan [Member] Year of 2012 [Member] Performance Shares [Member] Payable 2013 [Member]	Sep. 30, 2013 Long-Term Incentive Plan [Member] Year of 2012 [Member] Management [Member] Performance Shares [Member]	Dec. 31, 2012 Long-Term Incentive Plan [Member] Year of 2012 [Member] Management [Member] Performance Shares [Member]	Sep. 30, 2013 Long-Term Incentive Plan [Member] Year of 2012 [Member] Management [Member] Performance Shares [Member] Payable 2014 [Member]	Dec. 31, 2012 Long-Term Incentive Plan [Member] Year of 2012 [Member] Management [Member] Performance Shares [Member] Payable 2014 [Member]	Sep. 30, 2013 Long-Term Incentive Plan [Member] Year of 2012 [Member] Management [Member] Performance Shares [Member] Payable 2015 [Member]	Dec. 31, 2012 Long-Term Incentive Plan [Member] Year of 2012 [Member] Management [Member] Performance Shares [Member] Payable 2015 [Member]	Sep. 30, 2013 Long-Term Incentive Plan [Member] Year of 2013 [Member] Management [Member] Performance Shares [Member] Payable 2016 [Member]	Mar. 31, 2012 Long-Term Incentive Plan [Member] Year of 2013 [Member] Management [Member] Performance Shares [Member] Payable 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						1,112,330		278,084		834,246		1,637,601
Fair Value of Share Based Award						$ 39	$ 31	$ 10	$ 8	$ 29	$ 23	$ 54	$ 37
Share Based Award Liability, Current						38		10		28		40
Allocated Share-based Compensation Expense	$ 35	$ 47	$ 123	$ 148	$ 2