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GOODWILL AND OTHER INTANGIBLE ASSETS Intangible assets included in Other assets and intangibles (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Finite-lived intangible assets, useful life 6 years 10 months 24 days  
Total intangible assets, gross $ 793 $ 748
Finite-lived intangible assets, accumulated amortization 560 520
Total intangible assets, net $ 233 228
Customer lists and relationships    
Finite-lived intangible assets, useful life 11 years 9 months 18 days  
Finite-lived intangible assets, gross $ 221 223
Finite-lived intangible assets, accumulated amortization 175 171
Finite-lived intangible assets, net $ 46 52
Trademarks, trade names and other    
Finite-lived intangible assets, useful life 14 years 1 month 6 days  
Finite-lived intangible assets, gross $ 36 36
Finite-lived intangible assets, accumulated amortization 24 22
Finite-lived intangible assets, net 12 14
Non-amortized trade names and other    
Finite-lived intangible assets, gross 26 28
Finite-lived intangible assets, accumulated amortization 0 0
Indefinite-lived intangible assets, carrying amount $ 26 28
Capitalized software    
Finite-lived intangible assets, useful life 4 years 2 months 12 days  
Finite-lived intangible assets, gross $ 510 461
Finite-lived intangible assets, accumulated amortization 361 327
Finite-lived intangible assets, net $ 149 $ 134