Note 27: Condensed Combined Debtor-In-Possesion Financial Information (Detail) - Debtors' Statement of Retained Earnings (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Retained earnings at beginning of period	$ 4,071
Net loss	(1,379)	(764)	(687)	(209)	(442)
Retained earnings at end of period	2,600	4,071
Condensed Combined Debtor in Possession Retained Earnings [Member]
Retained earnings at beginning of period	4,849
Net loss	(1,379)
Loss from issuance of treasury stock	(92)
Retained earnings at end of period	$ 3,378