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Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 state | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 state | Dec. 31, 2012 | Mar. 31, 2011 Predecessor | Dec. 31, 2013 Error Correction | Dec. 31, 2013 Deferred Tax Asset Error Correction | Dec. 31, 2013 Other Noncurrent Liabilities Error Correction
Basis of presentation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which service is provided (states) | 14 |  |  |  |  |  |  |  |  | 14 |  |  |  |  |
Increase (decrease) in deferred income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17 | $ 2
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | (15) |  |
Net Income (Loss) Attributable to Parent | 236 | 218 | 246 | 264 | 241 | 212 | 178 | 218 | 543 | 964 | 849 | 299 |  |  |
Tax benefit associated with deduction for pension funding recognized in equity contribution |  |  |  |  |  |  |  | $ 100 |  |  | $ 100 |  |  |  |

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