Income Taxes Net Operating Loss and Tax Credit Carryforwards (Details) (State and Local Jurisdiction [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 1,451
Deferred income taxes on net operating loss carryforwards	52
Tax credit carryforwards	$ 16
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards expiration dates	Dec. 31, 2014
Tax credit carryforwards expiration dates	Dec. 31, 2014
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards expiration dates	Dec. 31, 2032