Acquisitions (Details Textuals) $ in Millions					1 Months Ended		3 Months Ended						9 Months Ended
	Jul. 27, 2020 USD ($) installment	Feb. 18, 2020 USD ($) MW	Dec. 04, 2019 USD ($)	Sep. 12, 2019 USD ($) MW	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Consideration paid for entity acquired, paid in cash													$ 126	$ 174
Goodwill						$ 2,464	$ 2,465						2,465
Operating Revenues — Non-utility operations							1,440			$ 1,463			3,770	4,584
Net Income							477	$ 277	$ 342	$ 317	$ 179	$ 408	1,096	$ 904
Power and Industrial Projects | South Jersey Industries, Combined Heat and Power Generation Facility
Business Acquisition [Line Items]
Amount of power associated with purchase of renewable energy project | MW		8
Consideration paid for entity acquired, paid in cash		$ 95
Power and Industrial Projects | South Jersey Industries, Combined Heat and Power Generation Facility | Contract intangibles
Business Acquisition [Line Items]
Intangible assets, amortization period		13 years
Intangible assets recorded as a result of acquisition		$ 17
Electric | Heritage Sustainable Energy, Renewable Energy Project | DTE Sustainable Generation
Business Acquisition [Line Items]
Amount of power associated with purchase of renewable energy project | MW				89
Total consideration provided for acquired entity				$ 175
Electric | Heritage Sustainable Energy, Renewable Energy Project | DTE Sustainable Generation | Contract intangibles
Business Acquisition [Line Items]
Intangible assets recorded as a result of acquisition				$ 109
Electric | Heritage Sustainable Energy, Renewable Energy Project | DTE Sustainable Generation | Contract intangibles | Minimum
Business Acquisition [Line Items]
Intangible assets, amortization period				11 years
Electric | Heritage Sustainable Energy, Renewable Energy Project | DTE Sustainable Generation | Contract intangibles | Maximum
Business Acquisition [Line Items]
Intangible assets, amortization period				13 years
Electric | Heritage Sustainable Energy, Additional Renewable Energy Project | DTE Sustainable Generation
Business Acquisition [Line Items]
Consideration paid for entity acquired, paid in cash					$ 33
Gas Storage and Pipelines | Blue Union and LEAP
Business Acquisition [Line Items]
Consideration paid for entity acquired, paid in cash			$ 2,360
Total consideration provided for acquired entity			$ 2,740
Percent of assets acquired			100.00%
Contingent consideration to be paid upon completion			$ 380
Accretion expense related to liability for contingent consideration payment							1						5
Payment of consideration upon achievement of final milestone	$ 385
Number of equal payment installments made upon achievement of final milestone | installment	2
Remaining cash consideration paid and held in escrow			14
Goodwill			$ 172				$ 172						172
Goodwill, working capital adjustments													$ 1
Direct transaction costs incurred						18
Issuance costs related to acquisition financing						49
Operating Revenues — Non-utility operations						15
Net Income						3
Gas Storage and Pipelines | Blue Union and LEAP | Mortgage bonds, notes, and other
Business Acquisition [Line Items]
Issuance costs related to acquisition financing						10
Gas Storage and Pipelines | Blue Union and LEAP | Common Stock
Business Acquisition [Line Items]
Issuance costs related to acquisition financing						$ 39
Gas Storage and Pipelines | Blue Union and LEAP | Customer relationships
Business Acquisition [Line Items]
Intangible assets, amortization period			40 years
Intangible assets recorded as a result of acquisition			$ 1,473
Existing intangible asset weighted-average amortization life			13 years