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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Schedule of Weighted-Average Useful Lives
The weighted-average useful lives approximate the following (in years):

Customer relationships
1 to 30
Patents and trademarks
5 to 30
Monitoring lines
7 to 10
Service portfolio and other
1 to 23
Identifiable intangible assets consisted of the following:

20212020
(In millions)Gross AmountAccumulated AmortizationNet AmountGross AmountAccumulated AmortizationNet Amount
Amortized:
Customer relationships$945 $(699)$246 $1,558 $(1,285)$273 
Patents and trademarks232 (182)50 301 (222)79 
Monitoring lines— — — 71 (59)12 
Service portfolios and other688 (539)149 644 (542)102 
1,865 (1,420)445 2,574 (2,108)466 
Unamortized:
Trademarks and other64  64 571 — 571 
Intangible assets, net$1,929 $(1,420)$509 $3,145 $(2,108)$1,037