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Impairment
 12 Months Ended
Dec. 31, 2022
Restructuring and Related Activities [Abstract]  
Impairment Impairment
Impairment expense, included in Cont Ops, for 2022, 2021 and 2020 is summarized as follows:
Year Ended December 31,
(in millions)202220212020
Impairment:
Goodwill associated with the Other reporting unit $40 $13 $169 
Intangible customer relationship associated with Stork— — 27 
Energy Solutions' equity method investments— 28 86 
Information technology assets— 16 16 
Fair value adjustment of Stork and AMECO assets (63)233 74 
Total impairment$(24)$290 $372 
As part of our assessment of goodwill in 2022, the fair value of the Other reporting unit was determined using a combination of observable level 2 inputs, including indicative offers and ongoing negotiations for the related assets. In 2020, the fair value of the reporting units was determined using an income based approach that utilized unobservable Level 3 inputs, including significant management assumptions such as expected awards, forecasted revenue and operating margins, weighted average cost of capital, working capital assumptions and general market trends and conditions.
The customer relationships' valuation approach utilized unobservable Level 3 inputs including ranges of assumptions of long-term revenue growth from 2% to 5.5% with a weighted average of 2.4%, weighted average cost of capital of 12% and a customer attrition factor of 10%.
During 2021 and 2020, we evaluated our significant investments and determined that certain of our investments were impaired. The fair value of these investments were determined using unobservable Level 3 inputs based on the forecast of anticipated volumes and overhead absorption in a cyclical business.
During 2022, we reversed $63 million of impairment originally recognized in 2021 when our Stork and AMECO businesses were classified as held for sale. The reversal relates primarily to remeasurement under held-and-used impairment criteria, for which CTA balances are excluded from carrying value. In 2021, the fair value of the Stork and AMECO assets were determined using a combination of observable level 2 inputs, including indicative offers and ongoing negotiations for the related assets.