Note 18: Condensed Combined Debtor-In-Possession Financial Information (Detail) - Debtors' Statement of Retained Earnings (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012	Jun. 30, 2012 Condensed Combined Debtor in Possession Retained Earnings [Member]	Jun. 30, 2012 Condensed Combined Debtor in Possession Retained Earnings [Member]
Retained earnings at beginning of period	$ 4,716	$ 4,071	$ 4,969	$ 3,645	$ 4,484	$ 4,910
Net loss		(665)	(425)		(299)	(665)
Loss from issuance of treasury stock	(1)	(60)	(8)
Retained earnings at end of period	$ 4,536	$ 3,346	$ 4,536	$ 3,645	$ 4,185	$ 4,185