Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Schedule of Weighted Average Depreciation Rates

The composite weighted average depreciation rates for utility plant by function were as follows:

Year Ended December 31,	2023		2022		2021(1)
(percent)
Generation		2.33		2.34		2.46
Transmission		2.54		2.36		2.56
Distribution		2.57		2.59		2.48
Storage		2.83		2.93		2.85
General and other		3.16		3.35		2.27

(1)In 2021, a change in depreciation rates was approved in connection with the settlement of the electric base rate case, which resulted in a decrease to depreciation expense of $6 million for the year ended December 31, 2021, and $12 million annually thereafter.

Schedule of Cash and Cash Equivalents

The following table provides a reconciliation of the total cash, restricted cash and equivalents reported within DESC’s Consolidated Balance Sheets to the corresponding amounts reported within DESC’s Consolidated Statements of Cash Flows for the years ended December 31, 2023, 2022 and 2021:

	Cash, Restricted Cash and Equivalents at End/Beginning of Year
	December 31, 2023		December 31, 2022		December 31, 2021		December 31, 2020
(millions)
Cash and cash equivalents	$	1	$	11	$	30	$	5
Restricted cash and equivalents(1)		—		—		24		—
Cash, restricted cash and equivalents shown in the    Consolidated Statements of Cash Flows	$	1	$	11	$	54	$	5

(1)Restricted cash and equivalent balances are presented within other current assets on the Consolidated Balance Sheets.

Schedule of Input And Assumptions Used in Measuring Fair Value

The inputs and assumptions used in measuring fair value include the following:

	Derivative Contracts
Inputs and assumptions	Commodity	Interest Rate
Forward commodity prices	X
Transaction prices	X
Volumes	X
Commodity location	X
Interest rates	X
Interest rate curves		X
Credit quality of counterparties and DESC	X	X
Credit enhancements	X	X
Time value	X	X
Notional value		X