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Arrangements With Off-Balance Sheet Risk (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2012
satellites
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Delta launch program inventories included in contributed assets     $ 1,360
Delta launch program inventories subject to an inventory supply agreement     1,860
Contributed inventories consumed by ULA     1,223
Inventory Supply Agreement Payments Received     1,080
Revenues and cost of sales recorded under the inventory supply agreement     766
Number of satellite missions     4
Additional potentially unrecoverable deferred production costs 114 271  
IRB asset, net of capital lease obligation 783   738
Contributed Delta Program Launch Inventory [Member]
      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Maximum Potential Payments 149   137
Indemnification Agreement [Member]
      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Maximum exposure to loss     279
Indemnification Agreement [Member] | Boeing Portion Of Additional Contract Losses [Member]
      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Maximum exposure to loss     18
Contract Pricing [Member]
      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Maximum Potential Payments 261   261
Carrying Amount of Liabilities 7   7
Other Delta Contracts [Member]
      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Maximum Potential Payments 203   232
Carrying Amount of Liabilities 8   8
Deferred Support and Production Costs [Member]
      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Loss contingency, estimate of possible loss     317
Other Indemnifications [Member]
      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Maximum Potential Payments 212   137
Carrying Amount of Liabilities 51   32
Residual Value Guarantees [Member]
      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Maximum Potential Payments 29   10
Carrying Amount of Liabilities 6   1
Guarantees expiration period (in years)     6
Deferred support costs [Member] | Other Delta Contracts [Member]
      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Maximum Potential Payments     85
Inventory Impact to Earnings [Member] | ULA [Member] | Earnings impact due to inventory write-down [Member]
      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Loss contingency, estimate of possible loss     $ 35