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RETIREMENT-RELATED BENEFITS - Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Retirement-Related Benefits        
Percentage of Co-sponsored plan assets 79.00%      
Defined Benefit Pension Plans        
Retirement-Related Benefits        
Fair value of plan assets, gross $ 326 $ 431 $ 483  
Investments measured at net asset value using NAV as a practical expedient 901 953 1,013  
Fair value of plan assets 1,226 1,383 1,496 $ 654
Defined Benefit Pension Plans | Equity Securities        
Retirement-Related Benefits        
Fair value of plan assets, gross   9 9  
Defined Benefit Pension Plans | Government and related        
Retirement-Related Benefits        
Fair value of plan assets, gross 107 147 158  
Defined Benefit Pension Plans | Corporate bonds        
Retirement-Related Benefits        
Fair value of plan assets, gross 20 29 32  
Defined Benefit Pension Plans | Insurance contracts        
Retirement-Related Benefits        
Fair value of plan assets, gross 191 224 255  
Defined Benefit Pension Plans | Cash and short-term investments        
Retirement-Related Benefits        
Fair value of plan assets, gross 3 10 14  
Defined Benefit Pension Plans | Derivatives        
Retirement-Related Benefits        
Fair value of plan assets, gross 5 12 15  
Defined Benefit Pension Plans | Level 1        
Retirement-Related Benefits        
Fair value of plan assets, gross 3 21 26  
Fair value of plan assets 3 21 26  
Defined Benefit Pension Plans | Level 1 | Equity Securities        
Retirement-Related Benefits        
Fair value of plan assets, gross   9 9  
Defined Benefit Pension Plans | Level 1 | Cash and short-term investments        
Retirement-Related Benefits        
Fair value of plan assets, gross 3 9 14  
Defined Benefit Pension Plans | Level 1 | Derivatives        
Retirement-Related Benefits        
Fair value of plan assets, gross   3 3  
Defined Benefit Pension Plans | Level 2        
Retirement-Related Benefits        
Fair value of plan assets, gross 322 410 457  
Fair value of plan assets 322 410 457  
Defined Benefit Pension Plans | Level 2 | Government and related        
Retirement-Related Benefits        
Fair value of plan assets, gross 107 147 158  
Defined Benefit Pension Plans | Level 2 | Corporate bonds        
Retirement-Related Benefits        
Fair value of plan assets, gross 20 29 32  
Defined Benefit Pension Plans | Level 2 | Insurance contracts        
Retirement-Related Benefits        
Fair value of plan assets, gross 191 224 255  
Defined Benefit Pension Plans | Level 2 | Cash and short-term investments        
Retirement-Related Benefits        
Fair value of plan assets, gross   1    
Defined Benefit Pension Plans | Level 2 | Derivatives        
Retirement-Related Benefits        
Fair value of plan assets, gross $ 5 $ 9 $ 12