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Quarterly Financial Data (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Quarterly Financial Information [Line Items]                      
Asset Impairment Charges                 $ 443,000,000 $ 93,000,000 $ 113,000,000
Revenue from Contract with Customer, Excluding Assessed Tax                 76,559,000,000 101,127,000,000 94,005,000,000
Litigation Settlement, Expense           $ 148,000,000          
Gain (Loss) on Disposition of Business $ 395                    
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount 371,000,000               371,000,000 412,000,000  
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.                 $ (111,000,000) $ (190,000,000) $ 250,000,000
Cash dividends declared, per share       $ 2.055       $ 1.71 $ 8.22 $ 7.19 $ 5.97
KC-46A Tanker [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Increase/(Decrease) in Earnings from operations due to change in accounting estimate. (108,000,000)     $ (50,000,000) $ (179,000,000) $ (426,000,000) $ (81,000,000)   $ (148,000,000) $ (736,000,000) $ (445,000,000)
Commercial Crew [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Increase/(Decrease) in Earnings from operations due to change in accounting estimate. (410,000,000)               (489,000,000)    
MQ-25 [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Loss on Contracts         291,000,000            
T-7A Red Hawk [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Loss on Contracts         400,000,000            
Tax Year 2013-2014 [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount                   $ 412,000,000  
Tax benefit related to settlement of federal tax audit         $ 412,000,000            
Operating Segments                      
Schedule of Quarterly Financial Information [Line Items]                      
Litigation Settlement, Expense   $ 109,000,000                  
Commercial Airplanes | Operating Segments | B-737-Max [Member] | Customer Concessions [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax (2,619,000,000) $ (5,610,000,000)             (8,259,000,000) [1]    
Global Services | Operating Segments | Trade Names [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 293,000,000               $ 293,000,000    
Lease Incentive Receivable [Member]                      
Schedule of Quarterly Financial Information [Line Items]                      
Asset Impairment Charges     $ 250,000,000                
[1]
(1) 
Net of insurance recoveries