Consolidated Statement Of Retained Earnings (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Retained earnings at beginning of period	$ 3,645	$ 4,716	$ 4,071	$ 4,969
Net loss	(299)	(179)	(665)	(425)
Loss from issuance of treasury stock		(1)	(60)	(8)
Retained earnings at end of period	$ 3,346	$ 4,536	$ 3,346	$ 4,536