Common and Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2017

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Schedule of Share Repurchases

In millions, except per share amounts		2017		2016		2015
Number of shares repurchased		43.0		16.6		39.9
Average price paid per share	$	7.55	$	6.37	$	7.60
Remaining authorization as of December 31	$	250	$	88	$	94