Stockholders' Equity 1 (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash dividends
Declaration date	May 05, 2015	May 15, 2014
Dividend per share (in dollars per share)	$ 0.25	$ 0.25
Record date	May 28, 2015	May 29, 2014
Total amount	$ 110	$ 111
Payment date	Jun. 16, 2015	Jun. 17, 2014