Share-Based Compensation Share-Based Compensation - Performance Shares Table (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 48	$ 14	$ 0
Long-Term Incentive Plan [Member] | Year of 2012 [Member] | Performance Shares [Member] | Payable 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	2
Long-Term Incentive Plan [Member] | Year of 2012 [Member] | Management [Member] | Performance Shares [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	1,112,331
Fair Value of Share Based Award	42	31
Share Based Award Liability, Current	41
Long-Term Incentive Plan [Member] | Year of 2012 [Member] | Management [Member] | Performance Shares [Member] | Payable 2014 [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	278,083
Fair Value of Share Based Award	11	8
Share Based Award Liability, Current	11
Long-Term Incentive Plan [Member] | Year of 2012 [Member] | Management [Member] | Performance Shares [Member] | Payable 2015 [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	834,248
Fair Value of Share Based Award	31	23
Share Based Award Liability, Current	30
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	1,600,438
Fair Value of Share Based Award	58	35
Share Based Award Liability, Current	$ 49