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RETIREMENT-RELATED BENEFITS - Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Retirement-Related Benefits      
Percentage of Co-sponsored plan assets 78.00%    
Defined Benefit Pension Plans      
Retirement-Related Benefits      
Fair value of plan assets, gross $ 483 $ 118  
Investments measured at net asset value using the NAV expedient 1,013 537  
Fair value of plan assets 1,496 654 $ 612
Defined Benefit Pension Plans | Equity Securities      
Retirement-Related Benefits      
Fair value of plan assets, gross 9    
Defined Benefit Pension Plans | Government and related      
Retirement-Related Benefits      
Fair value of plan assets, gross 158 18  
Defined Benefit Pension Plans | Corporate bonds      
Retirement-Related Benefits      
Fair value of plan assets, gross 32    
Defined Benefit Pension Plans | Insurance contracts      
Retirement-Related Benefits      
Fair value of plan assets, gross 255 91  
Defined Benefit Pension Plans | Cash and short-term investments      
Retirement-Related Benefits      
Fair value of plan assets, gross 14 1  
Defined Benefit Pension Plans | Derivatives      
Retirement-Related Benefits      
Fair value of plan assets, gross 15    
Defined Benefit Pension Plans | Other mutual funds      
Retirement-Related Benefits      
Fair value of plan assets, gross   7  
Defined Benefit Pension Plans | Level 1      
Retirement-Related Benefits      
Fair value of plan assets, gross 26 8  
Fair value of plan assets 26 8  
Defined Benefit Pension Plans | Level 1 | Equity Securities      
Retirement-Related Benefits      
Fair value of plan assets, gross 9    
Defined Benefit Pension Plans | Level 1 | Cash and short-term investments      
Retirement-Related Benefits      
Fair value of plan assets, gross 14 1  
Defined Benefit Pension Plans | Level 1 | Derivatives      
Retirement-Related Benefits      
Fair value of plan assets, gross 3    
Defined Benefit Pension Plans | Level 1 | Other mutual funds      
Retirement-Related Benefits      
Fair value of plan assets, gross   7  
Defined Benefit Pension Plans | Level 2      
Retirement-Related Benefits      
Fair value of plan assets, gross 457 110  
Fair value of plan assets 457 110  
Defined Benefit Pension Plans | Level 2 | Government and related      
Retirement-Related Benefits      
Fair value of plan assets, gross 158 18  
Defined Benefit Pension Plans | Level 2 | Corporate bonds      
Retirement-Related Benefits      
Fair value of plan assets, gross 32    
Defined Benefit Pension Plans | Level 2 | Insurance contracts      
Retirement-Related Benefits      
Fair value of plan assets, gross 255 91  
Defined Benefit Pension Plans | Level 2 | Derivatives      
Retirement-Related Benefits      
Fair value of plan assets, gross 12    
Nonpension Postretirement Plans      
Retirement-Related Benefits      
Fair value of plan assets   13 $ 12
Nonpension Postretirement Plans | Level 2 | Government and Corporate Bonds      
Retirement-Related Benefits      
Fair value of plan assets $ 0 $ 13