The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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+ Details

Legal Proceedings (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 employee	Dec. 31, 2012	Mar. 31, 2013 A12 Program [Member]	Dec. 31, 2012 A12 Program [Member]	Mar. 31, 2013 A12 Program [Member] Unliquidated Progress Payments [Member]	Dec. 29, 2009 A12 Program [Member] Unliquidated Progress Payments [Member]	Mar. 31, 2013 A12 Program [Member] Program Termination [Member]	Mar. 31, 2013 A12 Program [Member] Interest On Unliquidated Progress Payments [Member]
Legal Proceedings [Line Items]
Long-term contracts in progress	$ 15,246	$ 15,246	$ 15,130	$ 587
Inventory Valuation Reserves				350
Loss Contingency, Damages Awarded, Value	1,200
Loss Contingency, Estimate of Possible Loss				1,743		1,350	1,352	275	1,590
Inventory subject to uncertainty				237	237
Unrecorded gain contingency				$ 1,189
Individual Asserted Legal Claims		89
Employees Formally Employed at Wichita Facility		2,000