Income Taxes Income Taxes - NOL Activity Table (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 592
AMT net operating loss	650
Limited [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	49
AMT net operating loss	35
Annual Limitation [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	15
AMT net operating loss	$ 15