XML 94 R59.htm IDEA: XBRL DOCUMENT v3.20.4
GOODWILL (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Goodwill by Reportable Segment The following table presents goodwill by reportable segment:
(Millions of Dollars)Electric
Distribution
Electric
Transmission
Natural Gas
Distribution
Water DistributionTotal
Balance as of January 1, 2020$2,544 $577 $399 $907 $4,427 
Acquisition of CMA Assets— — 42 — 42 
Sale of Hingham water system
— — — (23)(23)
Balance as of December 31, 2020$2,544 $577 $441 $884 $4,446