Commitments And Contingencies (Narrative) (Details) (USD $)	3 Months Ended
	Apr. 01, 2012 D
Commitments And Contingencies [Line Items]
Discontinued operations charge, after-tax	$ 830,000,000
Discontinued operations charge, per share, after-tax	$ 2.31
Period preceding delivery of aircraft to customer fair market value of trade-in aircraft is established, days, maximum	120
Letters of credit	1,400,000,000
Termination Of A-12 Program [Member]
Commitments And Contingencies [Line Items]
Maximum amount contractors collectively would be required to repay the government	1,400,000,000
Interest and maximum amount contractors collectively would be required to pay the government	1,400,000,000
Interest on maximum amount contractors collectively would be required to pay the government	1,600,000,000
Loss contingency, maximum liability, pretax	1,500,000,000
Cash cost, after-tax	735,000,000
International Subsidiaries [Member]
Commitments And Contingencies [Line Items]
Letters of credit	1,100,000,000
European Land Systems [Member]
Commitments And Contingencies [Line Items]
Number of vehicles specified in contract	260
Period of contract, years	7
Contracts in process	$ 125,000,000