Other Assets (Tables)

12 Months Ended

Dec. 31, 2014

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Analysis of other assets

	December 31,
	2014		2013
	(millions)
Other current assets
Prepayments and accrued income	$	81	$	73
Income taxes receivable	30		32
Deferred compensation plan assets	17		26
Other receivables	86		66
Total other current assets	$	214	$	197
Other non-current assets
Deferred compensation plan assets	$	92	$	88
Income taxes receivable	—		21
Accounts receivable, net	29		28
Other investments	29		19
Other receivables	70		50
Total other non-current assets	$	220	$	206
Total other assets	$	434	$	403