Consolidated Statement of Shareholders' Equity (unaudited) - 3 months ended Mar. 31, 2016 - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Deferred Equity Compensation [Member]
Beginning balance (in shares) at Dec. 31, 2015		137,928,552
Beginning balance at Dec. 31, 2015	$ 6,063	$ 1	$ 1,342	$ 4,478	$ 237	$ 5
Increase (Decrease) in Shareholders' Equity
Net Income	59			59
Dividends ($0.13 per share)	(18)			(18)
Common stock repurchases (in shares)		(3,038,928)
Common stock repurchases	(75)	$ 0	(75)
Share-based compensation and other (in shares)		194,013
Share-based compensation and other	2		2
Other comprehensive income	82				82
Ending balance (in shares) at Mar. 31, 2016		135,083,637
Ending balance at Mar. 31, 2016	$ 6,113	$ 1	$ 1,269	$ 4,519	$ 319	$ 5