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Variable Interest Entities (Tables) | 12 Months Ended
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Dec. 31, 2017
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 |  | Trust IV |  | Trust V |  | Trust VI
2017 |  |  |  |  |  |  |  |  |  |  |
Dividend income | $ | 14 |  |  | $ | 20 |  |  | $ | 16 |  |  | $ | 17 |  |  | $ | 16 |  |  | $ | 12 |
Dividend distributions | 14 |  |  | 20 |  |  | 16 |  |  | 17 |  |  | 16 |  |  | 12 |
2016 |  |  |  |  |  |  |  |  |  |  |
Dividend income | $ | 27 |  |  | $ | 20 |  |  | $ | 16 |  |  | $ | 17 |  |  | $ | 13 |  |  | * |
Dividend distributions | 27 |  |  | 20 |  |  | 16 |  |  | 17 |  |  | 13 |  |  | * |
2015 |  |  |  |  |  |  |  |  |  |  |
Dividend income | $ | 27 |  |  | $ | 20 |  |  | $ | 16 |  |  | $ | 6 |  |  | * |  |  | * |
Dividend distributions | 27 |  |  | 20 |  |  | 16 |  |  | 6 |  |  | * |  |  | * |
* 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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