Short-Term Credit Arrangements and Borrowings (Details Textuals)	1 Months Ended	9 Months Ended
	Oct. 27, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 CAD ($)	Jul. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	May 31, 2020 CAD ($)	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Short-term Debt [Line Items]
Face amount of loan		$ 2,750,000,000
Amounts drawn		988,000,000							$ 828,000,000
Maximum borrowing capacity		3,810,000,000
Amounts outstanding		1,200,000,000
Debt redeemed		682,000,000
Unsecured term loan
Short-term Debt [Line Items]
Amounts outstanding		967,000,000
Revolving credit facility
Short-term Debt [Line Items]
Amounts outstanding		21,000,000
Letters of credit
Short-term Debt [Line Items]
Amounts outstanding		212,000,000
Unsecured term loan, expiring March 2021 | Unsecured term loan
Short-term Debt [Line Items]
Face amount of loan								$ 500,000,000
Amounts drawn		500,000,000
Maximum borrowing capacity		500,000,000
Unsecured term loan, expiring March 2021 | Unsecured term loan | Subsequent Event
Short-term Debt [Line Items]
Debt redeemed	$ 500,000,000
Unsecured Term Loan, Expiring April 2021 | Unsecured term loan
Short-term Debt [Line Items]
Maximum borrowing capacity		500,000,000
Unsecured Canadian Revolving Credit Facility, Expiring May 2023 | Revolving credit facility
Short-term Debt [Line Items]
Maximum borrowing capacity		83,000,000
Unsecured term loan, expiring June 2021 | Unsecured term loan
Short-term Debt [Line Items]
Face amount of loan					$ 167,000,000
Maximum borrowing capacity		167,000,000
Unsecured term loan, expiring June 2021 | Unsecured term loan | Subsequent Event
Short-term Debt [Line Items]
Debt redeemed	167,000,000
DTE Energy
Short-term Debt [Line Items]
Maximum borrowing capacity		2,510,000,000
Amounts outstanding		$ 900,000,000
Ratio of indebtedness to net capital		0.60	0.60
DTE Energy | Unsecured term loan
Short-term Debt [Line Items]
Amounts outstanding		$ 667,000,000
DTE Energy | Revolving credit facility
Short-term Debt [Line Items]
Amounts outstanding		21,000,000
DTE Energy | Letters of credit
Short-term Debt [Line Items]
Amounts outstanding		212,000,000
DTE Energy | Demand financing agreement
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement		300,000,000
Amount outstanding		43,000,000							$ 114,000,000
DTE Energy | Unsecured term loan, expiring March 2021 | Unsecured term loan
Short-term Debt [Line Items]
Maximum borrowing capacity		500,000,000
DTE Energy | Unsecured Term Loan, Expiring April 2021 | Unsecured term loan
Short-term Debt [Line Items]
Maximum borrowing capacity		0
DTE Energy | Unsecured Canadian Revolving Credit Facility, Expiring May 2023 | Revolving credit facility
Short-term Debt [Line Items]
Maximum borrowing capacity		83,000,000
DTE Energy | Unsecured term loan, expiring June 2021 | Unsecured term loan
Short-term Debt [Line Items]
Maximum borrowing capacity		167,000,000
DTE Energy | Other outstanding letters of credit | Letters of credit
Short-term Debt [Line Items]
Amounts outstanding		59,000,000
DTE Energy | Uncommitted letter of credit facility, Expiring July 2021 | Letters of credit
Short-term Debt [Line Items]
Maximum borrowing capacity				$ 50,000,000
DTE Energy | Demand financing agreement, indefinite term | Demand financing agreement
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement		100,000,000
Maximum additional margin financing		50,000,000
DTE Energy | Demand financing agreement, expiring in 2022 | Demand financing agreement
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement		$ 150,000,000
Maximum
Short-term Debt [Line Items]
Ratio of indebtedness to net capital		0.65	0.65
DTE Electric
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 900,000,000
Amounts outstanding		$ 200,000,000
Ratio of indebtedness to net capital		0.52	0.52
DTE Electric | Unsecured term loan
Short-term Debt [Line Items]
Amounts outstanding		$ 200,000,000
DTE Electric | Revolving credit facility
Short-term Debt [Line Items]
Amounts outstanding		0
DTE Electric | Letters of credit
Short-term Debt [Line Items]
Amounts outstanding		0
DTE Electric | Unsecured term loan, expiring March 2021 | Unsecured term loan
Short-term Debt [Line Items]
Maximum borrowing capacity		0
DTE Electric | Unsecured Term Loan, Expiring April 2021, Funded | Unsecured term loan
Short-term Debt [Line Items]
Face amount of loan							$ 200,000,000
Amounts drawn		200,000,000
DTE Electric | Unsecured Term Loan, Expiring April 2021, Unfunded | Unsecured term loan
Short-term Debt [Line Items]
Face amount of loan							200,000,000
Amounts drawn		0
DTE Electric | Unsecured Term Loan, Expiring April 2021 | Unsecured term loan
Short-term Debt [Line Items]
Maximum borrowing capacity		400,000,000
DTE Electric | Unsecured Canadian Revolving Credit Facility, Expiring May 2023 | Revolving credit facility
Short-term Debt [Line Items]
Maximum borrowing capacity		0
DTE Electric | Unsecured term loan, expiring June 2021 | Unsecured term loan
Short-term Debt [Line Items]
Maximum borrowing capacity		0
DTE Gas
Short-term Debt [Line Items]
Maximum borrowing capacity		400,000,000
Amounts outstanding		$ 100,000,000
Ratio of indebtedness to net capital		0.49	0.49
DTE Gas | Unsecured term loan
Short-term Debt [Line Items]
Amounts outstanding		$ 100,000,000
DTE Gas | Revolving credit facility
Short-term Debt [Line Items]
Amounts outstanding		0
DTE Gas | Letters of credit
Short-term Debt [Line Items]
Amounts outstanding		0
DTE Gas | Unsecured term loan, expiring March 2021 | Unsecured term loan
Short-term Debt [Line Items]
Maximum borrowing capacity		0
DTE Gas | Unsecured Term Loan, Expiring April 2021 | Unsecured term loan
Short-term Debt [Line Items]
Face amount of loan							100,000,000
Amounts drawn							$ 100,000,000
Maximum borrowing capacity		100,000,000
DTE Gas | Unsecured Term Loan, Expiring April 2021 | Unsecured term loan | Subsequent Event
Short-term Debt [Line Items]
Debt redeemed	$ 100,000,000
DTE Gas | Unsecured Canadian Revolving Credit Facility, Expiring May 2023 | Revolving credit facility
Short-term Debt [Line Items]
Maximum borrowing capacity		0
DTE Gas | Unsecured term loan, expiring June 2021 | Unsecured term loan
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 0
DTE Lake Erie Generation, Inc | Unsecured Canadian Revolving Credit Facility, Expiring May 2023 | Revolving credit facility
Short-term Debt [Line Items]
Maximum borrowing capacity						$ 110,000,000
Amounts outstanding			$ 28,000,000