Note 21: Other Postretirement Benefits (Detail) - Amounts Recognized in the Consolidated Statement of Financial Position (Other Postretirement Benefit Plans [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Balance sheet location for liabilities	$ (137)	$ (1,294)
Other current liabilities [Member]
Balance sheet location for liabilities	(23)	(122)
Pension and Other Postretirement Liabilities [Member]
Balance sheet location for liabilities	$ (114)	$ (1,172)