Arrangements With Off-Balance Sheet Risk (Schedule Of Arrangements With Off-Balance Sheet Risk) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Contingent Repurchase Commitments [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	$ 2,315	$ 3,290
Estimated Proceeds from Collateral/Recourse	2,315	3,290
Carrying Amount of Liabilities	5	7
Contributed Delta Program Launch Inventory [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	215	215
Contract Pricing [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	261	261
Carrying Amount of Liabilities	7	7
Other Delta Contracts [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	157	137
Carrying Amount of Liabilities	8	8
Other Indemnifications [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	144	212
Carrying Amount of Liabilities	33	51
Credit Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	13	17
Estimated Proceeds from Collateral/Recourse	4	12
Carrying Amount of Liabilities	2	2
Residual Value Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	11	29
Estimated Proceeds from Collateral/Recourse	10	21
Carrying Amount of Liabilities	$ 1	$ 6