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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2022
Asset Retirement Obligations Disclosure [Line Items]  
Summary of Asset Retirement Obligations By Type
The following table presents the Company's ARO liabilities by asset type as of December 31 (in millions):
20222021
Quad Cities Station$417 $427 
Fossil-fueled generating facilities396 466 
Wind-powered generating facilities353 299 
Solar-powered generating facilities30 25 
Offshore pipeline facilities14 14 
Other118 109 
Total asset retirement obligations$1,328 $1,340 
Quad Cities Station nuclear decommissioning trust funds$664 $768 
Reconciliation of Asset Retirement Obligation
The following table reconciles the beginning and ending balances of the Company's ARO liabilities for the years ended December 31 (in millions):
20222021
Beginning balance$1,340 $1,341 
Change in estimated costs2 81 
Acquisitions29 — 
Additions32 15 
Retirements(122)(144)
Accretion47 47 
Ending balance$1,328 $1,340 
Reflected as:
Other current liabilities $76 $130 
Other long-term liabilities1,252 1,210 
Total ARO liability$1,328 $1,340 
PAC  
Asset Retirement Obligations Disclosure [Line Items]  
Reconciliation of Asset Retirement Obligation
The following table reconciles the beginning and ending balances of PacifiCorp's ARO liabilities for the years ended December 31 (in millions):
20222021
Beginning balance$304 $270 
Change in estimated costs20 40 
Additions3 — 
Retirements(6)(15)
Accretion10 9 
Ending balance$331 $304 
Reflected as:
Other current liabilities$11 $5 
Other long-term liabilities320 299 
$331 $304 
MEC  
Asset Retirement Obligations Disclosure [Line Items]  
Summary of Asset Retirement Obligations By Type
The following table presents MidAmerican Energy's ARO liabilities by asset type as of December 31 (in millions):
20222021
Quad Cities Station$417 $427 
Fossil-fueled generating facilities76 161 
Wind-powered generating facilities210 197 
Solar-powered generating facilities and other4 2 
Total asset retirement obligations$707 $787 
Quad Cities Station nuclear decommissioning trust funds(1)
$664 $768 
(1)Refer to Note 6 for a discussion of the Quad Cities Station nuclear decommissioning trust funds.
Reconciliation of Asset Retirement Obligation
The following table reconciles the beginning and ending balances of MidAmerican Energy's ARO liabilities for the years ended December 31 (in millions):
20222021
Beginning balance$787 $818 
Change in estimated costs(27)35 
Additions2 6 
Retirements(85)(103)
Accretion30 31 
Ending balance$707 $787 
Reflected as:
Other current liabilities$24 $73 
Asset retirement obligations683 714 
$707 $787 
NPC  
Asset Retirement Obligations Disclosure [Line Items]  
Summary of Asset Retirement Obligations By Type
The following table presents Nevada Power's ARO liabilities by asset type as of December 31 (in millions):
20222021
Waste water remediation$31 $37 
Evaporative ponds and dry ash landfills14 13 
Solar-powered generating facilities3 3 
Other11 15 
Total asset retirement obligations$59 $68 
Reconciliation of Asset Retirement Obligation
The following table reconciles the beginning and ending balances of Nevada Power's ARO liabilities for the years ended December 31 (in millions):
20222021
Beginning balance$68 $72 
Change in estimated costs5 — 
Retirements(16)(6)
Accretion2 2 
Ending balance$59 $68 
Reflected as:
Other current liabilities$16 $19 
Other long-term liabilities43 49 
$59 $68 
SPPC  
Asset Retirement Obligations Disclosure [Line Items]  
Summary of Asset Retirement Obligations By Type
The following table presents Sierra Pacific's ARO liabilities by asset type as of December 31 (in millions):
20222021
Asbestos$5 $5 
Evaporative ponds and dry ash landfills3 3 
Other3 3 
Total asset retirement obligations$11 $11 
EEGH  
Asset Retirement Obligations Disclosure [Line Items]  
Reconciliation of Asset Retirement Obligation
The following table reconciles the beginning and ending balances of Eastern Energy Gas' ARO liabilities for the years ended December 31 (in millions):
20222021
Beginning balance$55 $71 
Additions4 — 
Retirements(12)(17)
Accretion1 1 
Ending balance$48 $55 
Reflected as:
Current liabilities$25 $33 
Other long-term liabilities23 22 
Total ARO liability$48 $55 
EGTS  
Asset Retirement Obligations Disclosure [Line Items]  
Reconciliation of Asset Retirement Obligation
The following table reconciles the beginning and ending balances of EGTS' ARO liabilities for the years ended December 31 (in millions):

20222021
Beginning balance$55 $71 
Additions4 — 
Retirements(12)(17)
Accretion1 1 
Ending balance$48 $55 
Reflected as:
Current liabilities$25 $33 
Other long-term liabilities23 22 
Total ARO liability$48 $55