Consolidated Statement of Shareholders' Equity (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Deferred Equity Compensation
Balance at Dec. 31, 2012	$ 4,994	$ 2	$ 2,724	$ 1,749	$ 515	$ 4
Balance (in shares) at Dec. 31, 2012		194,003,297
Increase (Decrease) in Shareholders' Equity
Net income (loss)	(144)	0	0	(144)	0	0
Dividends ($0.10 per share)	(19)	0	0	(19)	0	0
Common stock repurchases (in shares)		(1,914,566)
Common stock repurchases	(39)	0	(39)	0	0	0
Share-based compensation and other (in shares)		249,095
Share-based compensation and other	0	0	0	0	0	0
Other comprehensive loss	(68)	0	0	0	(68)	0
Balance at Mar. 31, 2013	$ 4,724	$ 2	$ 2,685	$ 1,586	$ 447	$ 4
Balance (in shares) at Mar. 31, 2013		192,337,826