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Selected Balance Sheet Data | 9 Months Ended
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Sep. 30, 2020
Balance Sheet Related Disclosures [Abstract] |
Selected Balance Sheet Data |
(Millions of Dollars) |  | Sept. 30, 2020 |  | Dec. 31, 2019
Accounts receivable, net |  |  |  |
Accounts receivable |  | $ | 965 |  |  | $ | 892 |
Less allowance for bad debts |  | (66) |  |  | (55) |
Accounts receivable, net |  | $ | 899 |  |  | $ | 837 |
(Millions of Dollars) |  | Sept. 30, 2020 |  | Dec. 31, 2019
Inventories |  |  |  |
Materials and supplies |  | $ | 275 |  |  | $ | 270 |
Fuel |  | 157 |  |  | 191 |
Natural gas |  | 80 |  |  | 83 |
Total inventories |  | $ | 512 |  |  | $ | 544 |
(Millions of Dollars) |  | Sept. 30, 2020 |  | Dec. 31, 2019
Property, plant and equipment, net |  |  |  |
Electric plant |  | $ | 46,531 |  |  | $ | 44,355 |
Natural gas plant |  | 6,899 |  |  | 6,560 |
Common and other property |  | 2,401 |  |  | 2,341 |
Plant to be retired (a) |  | 287 |  |  | 259 |
Construction work in progress |  | 3,265 |  |  | 2,329 |
Total property, plant and equipment |  | 59,383 |  |  | 55,844 |
Less accumulated depreciation |  | (17,456) |  |  | (16,735) |
Nuclear fuel |  | 2,930 |  |  | 2,909 |
Less accumulated amortization |  | (2,630) |  |  | (2,535) |
Property, plant and equipment, net |  | $ | 42,227 |  |  | $ | 39,483 |
(a)The CPUC has approved early retirement of PSCo’s Comanche Units 1 and 2 in approximately 2022 and 2025, respectively, and PSCo’s Craig 1 in approximately 2025. Amounts are presented net of accumulated depreciation.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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