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Segment and Related Information
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Segment and Related Information SEGMENT AND RELATED INFORMATION
DTE Energy sets strategic goals, allocates resources, and evaluates performance based on the following structure:
Electric segment consists principally of DTE Electric, which is engaged in the generation, purchase, distribution, and sale of electricity to approximately 2.2 million residential, commercial, and industrial customers in southeastern Michigan.
Gas segment consists principally of DTE Gas, which is engaged in the purchase, storage, transportation, distribution, and sale of natural gas to approximately 1.3 million residential, commercial, and industrial customers throughout Michigan and the sale of storage and transportation capacity.
Gas Storage and Pipelines is primarily engaged in services related to the gathering, transportation, and storage of natural gas.
Power and Industrial Projects is comprised primarily of projects that deliver energy and utility-type products and services to industrial, commercial, and institutional customers, produce reduced emissions fuel, and sell electricity and pipeline-quality gas from renewable energy projects.
Energy Trading consists of energy marketing and trading operations.
Corporate and Other includes various holding company activities, holds certain non-utility debt, and holds certain investments, including funds supporting regional development and economic growth.
The federal income tax provisions or benefits of DTE Energy’s subsidiaries are determined on an individual company basis and recognize the tax benefit of tax credits and net operating losses, if applicable. The state and local income tax provisions of the utility subsidiaries are also determined on an individual company basis and recognize the tax benefit of various tax credits and net operating losses, if applicable. The subsidiaries record federal, state, and local income taxes payable to or receivable from DTE Energy based on the federal, state, and local tax provisions of each company.
Inter-segment billing for goods and services exchanged between segments is based upon tariffed or market-based prices of the provider and primarily consists of the sale of reduced emissions fuel, power sales, and natural gas sales in the following segments:
Year Ended December 31,
202020192018
(In millions)
Electric(a)
$61 $56 $52 
Gas16 12 12 
Gas Storage and Pipelines26 27 36 
Power and Industrial Projects464 596 642 
Energy Trading31 22 27 
Corporate and Other2 2 2 
$600 $715 $771 
_______________________________________
(a)Inter-segment billing for the Electric segment includes $2 million relating to Non-utility operations for the year ended December 31, 2020.
Financial data of DTE Energy's business segments follows:
ElectricGasGas Storage and PipelinesPower and Industrial ProjectsEnergy TradingCorporate and OtherReclassifications
and
Eliminations		Total
(In millions)
2020
Operating Revenues — Utility operations$5,506 1,414 — — — — (75)$6,845 
Operating Revenues — Non-utility operations$14 — 754 1,224 3,863 2 (525)$5,332 
Depreciation and amortization$1,057 157 151 72 5 1 — $1,443 
Interest expense$337 80 113 37 6 331 (184)$720 
Interest income$(4)(5)(9)(22)(2)(180)184 $(38)
Equity in earnings of equity method investees$— 1 106 17 — 8 — $132 
Income Tax Expense (Benefit)$108 48 116 (40)12 (77)— $167 
Net Income (Loss) Attributable to DTE Energy Company$777 186 315 134 36 (80)— $1,368 
Investment in equity method investees$6 12 1,691 125 — 34 — $1,868 
Capital expenditures and acquisitions$2,701 574 517 186 5 — — $3,983 
Goodwill$1,208 743 472 26 17 — — $2,466 
Total Assets$26,588 6,339 5,068 696 807 8,071 (2,073)$45,496 
ElectricGasGas Storage and PipelinesPower and Industrial ProjectsEnergy TradingCorporate and OtherReclassifications
and
Eliminations		Total
(In millions)
2019
Operating Revenues — Utility operations$5,224 1,482 — — — — (68)$6,638 
Operating Revenues — Non-utility operations$5 — 501 1,560 4,610 2 (647)$6,031 
Depreciation and amortization$949 144 94 69 6 1 — $1,263 
Interest expense$315 78 73 33 8 266 (132)$641 
Interest income$(2)(6)(8)(9)(4)(120)132 $(17)
Equity in earnings of equity method investees$1 2 97 14 — (3)— $111 
Income Tax Expense (Benefit)$137 62 74 (63)17 (75)— $152 
Net Income (Loss) Attributable to DTE Energy Company$714 185 204 133 49 (116)— $1,169 
Investment in equity method investees$5 11 1,685 130 — 31 — $1,862 
Capital expenditures and acquisitions$2,368 530 2,510 54 5 — — $5,467 
Goodwill$1,208 743 470 26 17 — — $2,464 
Total Assets$24,617 5,717 4,832 537 798 7,610 (1,843)$42,268 
ElectricGasGas Storage and PipelinesPower and Industrial ProjectsEnergy TradingCorporate and OtherReclassifications
and
Eliminations		Total
(In millions)
2018
Operating Revenues — Utility operations$5,298 1,436 — — — — (64)$6,670 
Operating Revenues — Non-utility operations$— — 485 2,204 5,557 3 (707)$7,542 
Depreciation and amortization$836 133 82 67 5 1 — $1,124 
Interest expense$283 70 68 31 6 220 (119)$559 
Interest income$— (6)(9)(9)(3)(104)119 $(12)
Equity in earnings of equity method investees$— 2 123 3 — 4 — $132 
Income Tax Expense (Benefit)$193 67 68 (195)13 (48)— $98 
Net Income (Loss) Attributable to DTE Energy Company$664 150 235 161 39 (129)— $1,120 
Investment in equity method investees$7 12 1,585 134 — 33 — $1,771 
Capital expenditures and acquisitions$1,979 460 176 91 5 2 — $2,713 
Goodwill$1,208 743 299 26 17 — — $2,293 
Total Assets$22,501 5,378 3,161 495 909 6,153 (2,309)$36,288