Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based compensation

Stock-based compensation for the three months ended March 31 is as follows:

(in millions)	2016		2015
Stock option expense 1	$	2	$	6
Restricted stock and unit awards expense	12		12
Total stock-based compensation expense	$	14	$	18

¹  There were a minimal amount of stock options granted in 2015. During 2015, the Company stopped granting stock options.