Intangible Assets

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

Our intangible assets and liabilities, included in Other current assets, Other deferred debits and other assets, Other current liabilities, Other deferred credits and other liabilities in the Consolidated Balance Sheets, consisted of the following as of December 31, 2022 and 2021. The intangible assets and liabilities shown below are generally amortized on a straight line basis, except for unamortized energy contracts which are amortized in relation to the expected realization of the underlying cash flows:

	December 31, 2022						December 31, 2021
	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
Unamortized Energy Contracts	$	1,960	$	(1,708)	$	252	$	1,963	$	(1,673)	$	290
Customer Relationships	356		(265)		91		330		(243)		87
Trade Name	222		(222)		—		222		(218)		4
Total	$	2,538	$	(2,195)	$	343	$	2,515	$	(2,134)	$	381

The following table summarizes the amortization expense related to intangible assets and liabilities for each of the years ended December 31, 2022, 2021, and 2020:

For the Years Ended December 31,	Amortization Expense(a)
2022	$	61
2021	80
2020	81

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(a)See Note 23 — Supplemental Financial Information for additional information related to the amortization of unamortized energy contracts.

The following table summarizes the estimated future amortization expense related to intangible assets and liabilities as of December 31, 2022:

For the Years Ending December 31,	Estimated Future Amortization Expense
2023	$	59
2024	56
2025	47
2026	40
2027	27

Renewable Energy Credits

RECs are included in Renewable energy credits in the Consolidated Balance Sheets. Purchased RECs are recorded at cost on the date they are purchased. The cost of RECs purchased on a stand-alone basis is based on the transaction price, while the cost of RECs acquired through PPAs represents the difference between the total contract price and the market price of energy at contract inception. Generally, revenue for RECs that are sold to a counterparty under a contract that specifically identifies a power plant is recognized at a point in time when the power is produced. This includes both bundled and unbundled REC sales. Otherwise, the revenue is recognized upon physical transfer of the REC to the customer.

The following table presents current RECs as of December 31, 2022 and 2021:

	December 31, 2022		December 31, 2021
Current REC's	$	617	$	520