CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2012	$ 11,317	$ 0	$ 9,450	$ 1,893	$ (26)
Balance (in shares) at Dec. 31, 2012		1,112
Components of comprehensive income (loss):
Net income	837			837
Other comprehensive income (loss)	44				44
Issuance of common stock pursuant to employee stock options	92	0	92
Issuance of common stock pursuant to employee stock options (in shares)		9
Issuance of common stock pursuant to restricted stock rights (in shares)		4
Issuance of common stock pursuant to restricted stocks rights	0	0	0
Restricted stock surrendered for employees' tax liability	(19)	0	(19)
Restricted stock surrendered for employees' tax liability (in shares)		(1)
Stock-based compensation expense related to employee stock options and restricted stock rights	82		82
Tax benefit associated with employee stock awards	3		3
Dividends ($0.19 per common share) (See Note 12)	(217)			(217)
Balance at Sep. 30, 2013	$ 12,139	$ 0	$ 9,608	$ 2,513	$ 18
Balance (in shares) at Sep. 30, 2013		1,124