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Property Plant and Equipment
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENTThe following table summarizes the components of the electric generation and distribution assets and other property, plant and equipment (in millions) with their estimated useful lives (in years). The amounts are stated net of all prior asset impairment losses recognized.
Estimated Useful LifeDecember 31,
(in years)20222021
Electric generation and distribution facilities
5-39
$24,135 $22,909 
Other buildings
3-51
1,197 1,552 
Furniture, fixtures and equipment
3-30
348 356 
Other
1-40
919 735 
Total electric generation and distribution assets and other26,599 25,552 
Accumulated depreciation(8,651)(8,486)
Net electric generation and distribution assets and other$17,948 $17,066 
The following table summarizes depreciation expense (including the amortization of assets recorded under finance leases and the amortization of asset retirement obligations) and interest capitalized during development and construction on qualifying assets for the periods indicated (in millions):
Years Ended December 31,202220212020
Depreciation expense $982 $972 $1,004 
Interest capitalized during development and construction224 226 307 
Property, plant and equipment, net of accumulated depreciation, of $9 billion was mortgaged, pledged or subject to liens as of both December 31, 2022 and 2021, including assets classified as held-for-sale.
The following table summarizes regulated and non-regulated generation and distribution property, plant and equipment and accumulated depreciation as of the dates indicated (in millions):
December 31,20222021
Regulated generation and distribution assets and other, gross$9,709 $9,151 
Regulated accumulated depreciation(4,067)(3,655)
Regulated generation and distribution assets and other, net5,642 5,496 
Non-regulated generation and distribution assets and other, gross16,890 16,401 
Non-regulated accumulated depreciation(4,584)(4,831)
Non-regulated generation and distribution assets and other, net12,306 11,570 
Net electric generation and distribution assets and other$17,948 $17,066