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GOODWILL AND OTHER INTANGIBLE ASSETS Intangible assets included in Other assets and intangibles (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Total intangible assets, gross $ 748 $ 1,163
Finite-lived intangible assets, accumulated amortization 520 859
Total 200  
Total intangible assets, net 228 304
Customer lists and relationships    
Finite-lived intangible assets, gross 223 401
Finite-lived intangible assets, accumulated amortization 171 301
Total 52 100
Trademarks, trade names and other    
Finite-lived intangible assets, gross 36 36
Finite-lived intangible assets, accumulated amortization 22 20
Total 14 16
Non-amortized trade names and other    
Finite-lived intangible assets, gross 28 100
Finite-lived intangible assets, accumulated amortization 0 38
Indefinite-lived intangible assets, carrying amount 28 62
Capitalized software    
Finite-lived intangible assets, gross 461 626
Finite-lived intangible assets, accumulated amortization 327 500
Total 134 $ 126
Retirement of fully amortized capitalized software $ 223  
Weighted average life    
Finite-lived intangible assets, useful life 7 years 1 month 6 days  
Weighted average life | Customer lists and relationships    
Finite-lived intangible assets, useful life 11 years 9 months 18 days  
Weighted average life | Trademarks, trade names and other    
Finite-lived intangible assets, useful life 14 years 1 month 6 days  
Weighted average life | Capitalized software    
Finite-lived intangible assets, useful life 4 years 2 months 12 days