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Note 21: Other Postretirement Benefits (Detail) - Amounts Recognized in Accumulated Other Comprehensive Loss (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Prior service credit	$ 1,118	$ 751
Net actuarial loss	(73)	(492)
	$ 1,045	$ 259

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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