Arrangements With Off-Balance Sheet Risk (Schedule Of Arrangements With Off-Balance Sheet Risk) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Contingent Repurchase Commitment [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	$ 2,065	$ 3,290
Estimated Proceeds from Collateral or Recourse	2,065	3,290
Carrying Amount of Liabilities	5	7
Contributed Delta Program Launch Inventory [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	137	149
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	232	203
Carrying Amount of Liabilities	8	8
Other Indemnifications [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	137	212
Carrying Amount of Liabilities	32	51
Residual Value Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum Potential Payments	10	29
Estimated Proceeds from Collateral or Recourse	9	21
Carrying Amount of Liabilities	$ 1	$ 6