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	456			456
Other comprehensive income (loss)	(69)				(69)
Issuance of common stock pursuant to employee stock options	33	0	33
Issuance of common stock pursuant to employee stock options (in shares)		3
Issuance of common stock pursuant to restricted stocks (in shares)		3
Issuance of common stock pursuant to restricted stocks	0	0	0
Restricted stock surrendered for employees' tax liability	(14)	0	(14)
Restricted stock surrendered for employees' tax liability (in shares)		(1)
Stock-based compensation expense related to employee stock options and restricted stock rights	27		27
Tax benefit associated with employee stock options	2		2
Dividends ($0.19 per common share) (See Note 11)	(217)			(217)
Balance at Mar. 31, 2013	$ 11,535	$ 0	$ 9,498	$ 2,132	$ (95)
Balance (in shares) at Mar. 31, 2013		1,117