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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Schedule of Weighted Average Depreciation Rates The composite weighted average depreciation rates for utility plant by function were as follows:

 

 

 

2021(1)

 

 

2020

 

Generation

 

 

2.46

%

 

 

2.50

%

Transmission

 

 

2.56

%

 

 

2.56

%

Distribution

 

 

2.48

%

 

 

2.42

%

Storage

 

 

2.85

%

 

 

2.75

%

General and other

 

 

2.27

%

 

 

3.17

%

 

(1)

Rates include the impact of a change in depreciation rates approved in connection with the settlement of the electric base rate case, which resulted in a decrease to depreciation expense of $6 million and an expected annual decrease of $12 million.
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, 2021, 2020 and 2019:

 

 

Cash, Restricted Cash and Equivalents at End/Beginning of Year

 

 

 

December 31, 2021

 

 

December 31, 2020

 

 

December 31, 2019

 

 

December 31, 2018

 

(millions)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash and cash equivalents

 

$

30

 

 

$

5

 

 

$

4

 

 

$

377

 

Restricted cash and equivalents(1)

 

 

24

 

 

 

—

 

 

 

—

 

 

 

—

 

Cash, restricted cash and equivalents shown in the

   Consolidated Statements of Cash Flows

 

$

54

 

 

$

5

 

 

$

4

 

 

$

377

 

(1)

At December 31 2020, 2019 and 2018 there were no restricted cash and equivalent balances.