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Segment and Revenue Information (Schedule Of Unallocated Items and Eliminations) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]        
Share-based plans   $ (212) $ (202) $ (202)
Deferred compensation   (174) (19) (240)
Amortization of previously capitalized interest   (83) (81) (110)
Research and Development Expense   (3,219) (3,269) (3,179)
Asset Impairment Charges   (443) (93) (113)
Litigation Settlement, Expense $ (148)      
Unallocated items, eliminations and other        
Segment Reporting Information [Line Items]        
Share-based plans   (65) (76) (77)
Deferred compensation   (174) (19) (240)
Amortization of previously capitalized interest   (89) (92) (96)
Research and Development Expense   (384) (132) 42
Asset Impairment Charges   (250)    
Litigation Settlement, Expense     (148)  
Eliminations and other unallocated items   995 975 756
Operating Loss Excluding Unallocated Pension and Postretirement Adjustments   (2,066) (1,442) (1,127)
FAS/CAS Service Cost Adjustment   1,415 1,327 1,438
Unallocated items, eliminations and other | Pension [Member]        
Segment Reporting Information [Line Items]        
FAS/CAS Service Cost Adjustment   1,071 1,005 1,127
Unallocated items, eliminations and other | Postretirement [Member]        
Segment Reporting Information [Line Items]        
FAS/CAS Service Cost Adjustment   $ 344 $ 322 $ 311