Stockholders' Equity 1 (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016
Cash dividends
Declaration date	Aug. 09, 2017	May 09, 2017	Aug. 03, 2016	May 04, 2016
Dividend per share (in dollars per share)	$ 0.255	$ 0.255	$ 0.255	$ 0.255
Record date	Aug. 24, 2017	May 25, 2017	Aug. 25, 2016	May 26, 2016
Total amount	$ 108	$ 107	$ 107	$ 107
Payment date	Sep. 12, 2017	Jun. 13, 2017	Sep. 13, 2016	Jun. 14, 2016