Income Taxes Statutory Income Tax Rate Reconciliation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$ (166)	$ 1
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	241	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	0	28
Income Tax Reconciliation, State and Local Income Taxes	36	16
Income Tax Reconciliation, Other Reconciling Items	(14)	18
Income tax expense from continuing operations	97	63	19
Corporate Subsidiaries [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	(166)	1
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	241	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	0	28
Income Tax Reconciliation, State and Local Income Taxes	31	9
Income Tax Reconciliation, Other Reconciling Items	(13)	18
Income tax expense from continuing operations	93	56
Partnership [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	0	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	0	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	0	0
Income Tax Reconciliation, State and Local Income Taxes	5	7
Income Tax Reconciliation, Other Reconciling Items	(1)	0
Income tax expense from continuing operations	$ 4	$ 7