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Significant Group Concentrations Of Risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Concentration Risk [Line Items]    
Gross accounts receivable and gross customer financing $ 13,639  
Gross customer financing 3,061 $ 4,211
External Credit Rating, Non Investment Grade [Member]    
Concentration Risk [Line Items]    
Gross customer financing $ 1,828  
Workforce Subject To Collective Bargaining Arrangements [Member]    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 37.00%  
Commercial Aircraft Customers [Member]    
Concentration Risk [Line Items]    
Gross accounts receivable and gross customer financing $ 5,572  
Accounts Receivable, Gross, Current 2,512  
Gross customer financing 3,060  
U S Government Contracts [Member]    
Concentration Risk [Line Items]    
Accounts Receivable, Gross, Current $ 5,989 $ 4,639
Silk Way Airlines [Member] | Customer Financing [Member] | External Credit Rating, Non Investment Grade [Member]    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 14.00%  
American Airlines [Member] | Customer Financing [Member] | External Credit Rating, Non Investment Grade [Member]    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 8.00%  
Hawaiian Airlines [Member] | Customer Financing [Member] | External Credit Rating, Non Investment Grade [Member]    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 7.00%