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Property Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
The 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)20212020
Electric generation and distribution facilities
5-39
$22,909 $24,239 
Other buildings
5-51
1,552 1,507 
Furniture, fixtures and equipment
3-30
356 333 
Other
1-39
735 628 
Total electric generation and distribution assets and other25,552 26,707 
Accumulated depreciation(8,486)(8,472)
Net electric generation and distribution assets and other$17,066 $18,235 
The following table summarizes depreciation expense (including the amortization of assets recorded under finance leases in 2021, 2020 and 2019, 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 31,202120202019
Depreciation expense $972 $1,004 $977 
Interest capitalized during development and construction226 307 238 
Property, plant and equipment, net of accumulated depreciation, of $9 billion and $10 billion was mortgaged, pledged or subject to liens as of December 31, 2021 and 2020, respectively, 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 31,20212020
Regulated generation and distribution assets and other, gross$9,151 $8,858 
Regulated accumulated depreciation(3,655)(3,329)
Regulated generation and distribution assets and other, net5,496 5,529 
Non-regulated generation and distribution assets and other, gross16,401 17,849 
Non-regulated accumulated depreciation(4,831)(5,143)
Non-regulated generation and distribution assets and other, net11,570 12,706 
Net electric generation and distribution assets and other$17,066 $18,235