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RETIREMENT-RELATED BENEFITS - OCI and AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2023
Dec. 31, 2021
Dec. 31, 2020
Changes in AOCI for retirement-related benefits        
Current period loss (gain) $ (136) $ (175) $ (72) $ 41
Curtailments and settlements (4) (10) (3)  
Amortization of net loss included in net periodic benefit cost (16) (40) (51) (36)
Current period prior service costs (credits)   (4) (1)  
Amortization for prior service costs (credits) included in net periodic benefit cost   (1)   1
Defined Benefit Pension Plans        
Changes in AOCI for retirement-related benefits        
Net loss (gain) at beginning of period 629 474 314  
Current period loss (gain) (135) (172) (75)  
Curtailments and settlements (4) (10) (3)  
Amortization of net loss included in net periodic benefit cost (15) (39) (51)  
Separation related transfers from Parent     444  
Net loss (gain) at end of period 474 253 629 314
Prior service costs (credits) at beginning of period 9 9 (2)  
Current period prior service costs (credits)     3  
Amortization for prior service costs (credits) included in net periodic benefit cost   (1)    
Separation related transfers from Parent     9  
Prior service costs (credits) at end of period 9 8 9 $ (2)
Total amounts recognized in accumulated other comprehensive loss (income) $ 484 $ 261 $ 638