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Property Plant and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
The following table summarizes the components of 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)20242023
Electric generation and distribution facilities
8-40
$29,740 $27,517 
Other buildings
3-48
1,232 1,239 
Furniture, fixtures and equipment
3-30
423 397 
Other
5-39
1,428 1,037 
Total electric generation, distribution assets and other
32,823 30,190 
Accumulated depreciation(8,701)(8,602)
Net electric generation, distribution assets and other
$24,122 $21,588 
Land
610 522 
Construction in progress
8,434 7,848 
Property, plant and equipment, net
$33,166 $29,958 
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 31,202420232022
Depreciation expense $1,146 $1,045 $982 
Interest capitalized during development and construction
637 563 224 
Property, plant and equipment, net of accumulated depreciation, of $9.9 billion and $9.5 billion was mortgaged, pledged or subject to liens as of December 31, 2024 and 2023, 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 31,20242023
Non-regulated electric generation assets and other, gross$21,954 $20,195 
Non-regulated accumulated depreciation(4,704)(4,777)
Non-regulated electric generation assets and other, net17,250 15,418 
Regulated electric generation, distribution assets and other, gross10,869 9,995 
Regulated accumulated depreciation(3,997)(3,825)
Regulated electric generation, distribution assets and other, net6,872 6,170 
Net electric generation, distribution assets and other$24,122 $21,588