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Property Plant and Equipment
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
The following table summarizes the components of the electric generation, distribution, 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)20232022
Electric generation and distribution facilities
5-40
$27,517 $24,135 
Other buildings
3-51
1,239 1,197 
Furniture, fixtures and equipment
3-30
397 348 
Other
1-39
1,037 919 
Total electric generation, distribution assets and other
30,190 26,599 
Accumulated depreciation(8,602)(8,651)
Net electric generation, distribution assets and other
$21,588 $17,948 
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 31,202320222021
Depreciation expense $1,045 $982 $972 
Interest capitalized during development and construction563 224 226 
Property, plant and equipment, net of accumulated depreciation, of $9.5 billion and $8.9 billion was mortgaged, pledged or subject to liens as of December 31, 2023 and 2022, respectively, including assets classified as held-for-sale.
The following table summarizes non-regulated and regulated electric generation, distribution, and other property, plant and equipment and accumulated depreciation as of the dates indicated (in millions):
December 31,20232022
Non-regulated electric generation assets and other, gross$20,195 $16,890 
Non-regulated accumulated depreciation(4,777)(4,584)
Non-regulated electric generation assets and other, net15,418 12,306 
Regulated electric generation, distribution assets and other, gross9,995 9,709 
Regulated accumulated depreciation(3,825)(4,067)
Regulated electric generation, distribution assets and other, net6,170 5,642 
Net electric generation, distribution assets and other$21,588 $17,948