Consolidated Statement of Shareholders' Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Deferred Equity Compensation
Beginning balance (in shares) at Dec. 31, 2014		158,306,661
Beginning balance at Dec. 31, 2014	$ 5,758	$ 2	$ 1,887	$ 3,494	$ 370	$ 5
Increase (Decrease) in Shareholders' Equity
Net Income	498			498
Dividends ($0.24 per share)	(37)			(37)
Common stock repurchases (in shares)		(10,597,679)
Common stock repurchases	(285)	$ (1)	(284)
Share-based compensation and other (in shares)		548,215
Share-based compensation and other	3		3
Other comprehensive loss	(131)				(131)
Ending balance (in shares) at Jun. 30, 2015		148,257,197
Ending balance at Jun. 30, 2015	$ 5,806	$ 1	$ 1,606	$ 3,955	$ 239	$ 5