Arrangements With Off-Balance Sheet Risk (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended
	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2019	Dec. 31, 2018
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Offsetting capital lease obligation and IRB asset			$ 271
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 Delta Program Launch Inventory [Member] | ULA [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum Potential Payments			30	$ 52
Contract Pricing [Member] | ULA [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum Potential Payments			34	85
Carrying Amount of Liabilities
Other Delta Contracts [Member] | Deferred support costs [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potentially Unrecoverable Costs Under Contracts		$ 271
Other Delta Contracts [Member] | Deferred production costs [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Potentially Unrecoverable Costs Under Contracts	$ 114
Other Delta Contracts [Member] | ULA [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum Potential Payments			317	317
Carrying Amount of Liabilities			48
Deferred Support and Production Costs [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum Potential Payments			317
Loss Contingency, Estimate of Possible Loss			269
Credit Guarantees [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Maximum Potential Payments			92	106
Carrying Amount of Liabilities			$ 16	$ 16