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Segment and Revenue Information (Schedule Of Unallocated Items and Eliminations) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Share-based plans $ (833) $ (250) $ (212)
Deferred compensation (126) (93) (174)
Amortization of previously capitalized interest (76) (81) (83)
Research and Development Expense (2,249) (2,476) (3,219)
Nonrecurring fair value losses (98) (410) (443)
Corporate Reconciling Items And Eliminations [Member]      
Segment Reporting Information [Line Items]      
Share-based plans (174) (120) (65)
Deferred compensation (126) (93) (174)
Amortization of previously capitalized interest (107) (95) (89)
Research and Development Expense (184) (240) (401)
Nonrecurring fair value losses     (250)
Litigation Settlement, Expense     (109)
Eliminations and other unallocated items (676) (1,807) (985)
Operating Loss Excluding Unallocated Pension and Postretirement Adjustments (1,267) (2,355) (2,073)
FAS/CAS Service Cost Adjustment 1,173 1,383 1,415
Corporate Reconciling Items And Eliminations [Member] | Pension [Member]      
Segment Reporting Information [Line Items]      
FAS/CAS Service Cost Adjustment 882 1,024 1,071
Corporate Reconciling Items And Eliminations [Member] | Postretirement [Member]      
Segment Reporting Information [Line Items]      
FAS/CAS Service Cost Adjustment $ 291 $ 359 $ 344