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RETIREMENT-RELATED BENEFITS - Net Funded Status (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Net funded status recognized in the Consolidated Statement of Financial Position    
Prepaid pension assets $ 4,643 $ 3,034
Current liabilities - compensation and benefits (3,644) (3,577)
Noncurrent liabilities - retirement and nonpension postretirement benefit obligations (16,720) (17,070)
Pension Plans | U.S.    
Net funded status recognized in the Consolidated Statement of Financial Position    
Prepaid pension assets 2,092 1,002
Current liabilities - compensation and benefits (120) (118)
Noncurrent liabilities - retirement and nonpension postretirement benefit obligations (1,722) (1,698)
Funded Status 250 (814)
Pension Plans | Non-U.S.    
Net funded status recognized in the Consolidated Statement of Financial Position    
Prepaid pension assets 2,551 2,032
Current liabilities - compensation and benefits (323) (303)
Noncurrent liabilities - retirement and nonpension postretirement benefit obligations (10,541) (10,689)
Funded Status (8,312) (8,960)
Nonpension Postretirement Plans | U.S.    
Net funded status recognized in the Consolidated Statement of Financial Position    
Prepaid pension assets 0 0
Current liabilities - compensation and benefits (353) (368)
Noncurrent liabilities - retirement and nonpension postretirement benefit obligations (3,812) (4,076)
Funded Status (4,165) (4,444)
Nonpension Postretirement Plans | Non-U.S.    
Net funded status recognized in the Consolidated Statement of Financial Position    
Prepaid pension assets 0 0
Current liabilities - compensation and benefits (17) (15)
Noncurrent liabilities - retirement and nonpension postretirement benefit obligations (646) (607)
Funded Status $ (663) $ (622)