Arrangements With Off-Balance Sheet Risk (Narrative) (Details) $ in Millions	1 Months Ended		12 Months Ended
	Dec. 31, 2011 USD ($)	Jun. 30, 2011 USD ($)	Dec. 31, 2015 USD ($) satellites	Dec. 31, 2014 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of satellite missions | satellites			4
Potentially Unrecoverable Costs Under Contracts	$ 114	$ 271
Offsetting capital lease obligation and IRB asset			$ 584	$ 638
ULA [Member]
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			1,253
Inventory Supply Agreement Payments Received			1,740
Payments made under inventory supply agreement			71
Inventory Supply Agreement Revenue and Costs of Sales Recorded			1,367
Contributed Delta Program Launch Inventory [Member] | ULA [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum Potential Payments			$ 107	114
Indemnification Agreement [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of satellite missions | satellites			3
Maximum exposure to loss			$ 277
Other Delta Contracts [Member] | Deferred support costs [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum Potential Payments			85
Other Delta Contracts [Member] | Deferred production costs [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum Potential Payments			91
Other Delta Contracts [Member] | ULA [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum Potential Payments			231	$ 150
Carrying Amount of Liabilities			5
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				$ 63
Carrying Amount of Liabilities				20
Credit Guarantees [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum Potential Payments			$ 30	30
Carrying Amount of Liabilities			$ 2	$ 2
Guarantor Obligations, Term			5