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Inventories (Inventory Disclosure Table) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Long-term contracts in progress $ 13,257 $ 12,608
Commercial aircraft programs 51,789 48,065
Commercial spare parts, used aircraft, general stock materials and other 7,641 7,793
Inventory before advances and progress billings 72,687 68,466
Less advances and progress billings (27,746) (25,554)
Total $ 44,941 $ 42,912