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Variable Interest Entities (Tables) | 12 Months Ended
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Dec. 31, 2014
Variable Interest Entities Disclosure [Abstract] |
Variable Interest Entity, Condensed Income Statement | The following table provides a summary of the trusts' income statements:
| Years ended December 31,
(in millions) | Trust I |  | Trust II |  | Trust III
2014 |  |  |  |  |
Dividend income | $ | 27 |  |  | $ | 20 |  |  | $ | 13 |
Dividend distributions | 27 |  |  | 20 |  |  | 13 |
2013 |  |  |  |  |
Dividend income | $ | 27 |  |  | $ | 19 |  |  | * |
Dividend distributions | 27 |  |  | 19 |  |  | * |
2012 |  |  |  |  |
Dividend income | $ | 17 |  |  | * |  |  | * |
Dividend distributions | 17 |  |  | * |  |  | * |
* Not applicable

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- Definition Variable Interest Entities, Condensed Income Statement [Table Text Block] + References No definition available. + Details
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