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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 IRS	Dec. 31, 2012 State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Period that cumulative effect of change in tax accounting is included in taxable income	4 years
Deferred tax liabilities related to cumulative adjustments to be reflected in taxable income in 2014		$ 13
Reduction of valuation allowance			$ (20)

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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