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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Forecast item | Sep. 30, 2013 State | Sep. 30, 2014 Federal | Dec. 31, 2010 Federal | Dec. 31, 2012 Federal | Dec. 31, 2011 Federal
Income taxes |  |  |  |  |  |  |  |  |  |  |
Effective tax rate (as a percent) | 75.00% | 24.00% | 36.00% | 24.00% |  |  |  |  |  |  |
Income tax benefit on uncertain tax positions, expiration of statutes of limitations and settlements on audits |  |  |  |  |  |  | $ 12 |  |  |  |
Period of cumulative loss position |  |  | 3 years |  |  |  |  |  | 3 years |  |
Valuation allowance |  |  |  |  |  |  |  |  | 372 |  |
Increase in valuation allowance |  |  |  |  |  |  |  |  |  | 65 | 89
Tax benefit from release of valuation allowance | 517 |  |  |  |  |  |  |  |  |  |
Net short-term deferred tax assets | 265 |  | 265 |  | 73 |  |  |  |  |  |
Period of cumulative income position |  |  |  |  |  | 3 years |  |  |  |  |
Number of consecutive quarters of pre-tax earnings |  |  |  |  |  | 7 |  |  |  |  |
Reversal of valuation allowance by the end of 2015 |  |  |  |  |  | 35 |  |  |  |  |
Additional tax expense |  |  |  |  |  |  |  | $ 51 |  |  |

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