Annual report pursuant to Section 13 and 15(d)

REVENUE RECOGNITION - Narratives (Details)

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REVENUE RECOGNITION - Narratives (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Increase (decrease) in allowance for expected credit losses $ 45  
Allowance for receivables 138 $ 93
Provisions for doubtful receivables 254 194
Contract assets 279 272
Deferred revenue 279 264
Contract liability, current 21 7
Contract liability, noncurrent $ 26 $ 26