CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2012	$ 7,087	$ 6,019	$ 47,016	$ (44,815)	$ (1,133)
Balance (in shares) at Dec. 31, 2012		3,010
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(643)			(643)
Other Comprehensive Income, Net of Tax	14				14
Stock Issued During Period, Shares, New Issues		3
Stock Issued During Period, Value, New Issues	7	7	1
Stock Issued During Period, Value, Stock Options Exercised				(1)
Share-based compensation expense	9		9
Balance at Mar. 31, 2013	$ 6,474	$ 6,026	$ 47,026	$ (45,459)	$ (1,119)
Balance (in shares) at Mar. 31, 2013		3,013