Variable Interest Entities (Tables)

12 Months Ended

Dec. 31, 2017

Variable Interest Entities Disclosure [Abstract]

Variable Interest Entity, Condensed Income Statement

The followingtable 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