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Merger Transaction and Integration Costs (Tables) | 9 Months Ended
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Sep. 30, 2013
Business Combinations [Abstract] |
Merger Transaction and Integration Costs | The following table sets forth merger transaction and integration costs recognized for the three and nine months ended September 30, 2013, and 2012.
| Three Months Ended September 30, | Nine Months Ended September 30,
| 2013 | 2012 | 2013 | 2012
| (in millions)
Merger transaction costs | $ | 2 |  | $ | 4 |  | $ | 21 |  | $ | 4 |
Merger integration costs | 13 |  | — |  | 41 |  | — |
Total merger related costs | $ | 15 |  | $ | 4 |  | $ | 62 |  | $ | 4 |

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