Short-Term Credit Arrangements and Borrowings (Details Textuals)	Sep. 30, 2021	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 2,732,000,000
Amounts outstanding		299,000,000
Revolving credit facility
Short-term Debt [Line Items]
Amounts outstanding		69,000,000
Letters of credit
Short-term Debt [Line Items]
Amounts outstanding		230,000,000
Secured revolving credit facility, expiring June 2026
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 33,000,000
DTE Electric
Short-term Debt [Line Items]
Ratio of indebtedness to net capital		0.53
Maximum borrowing capacity		$ 500,000,000
Amounts outstanding		0
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 | Secured revolving credit facility, expiring June 2026
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 0
DTE Gas
Short-term Debt [Line Items]
Ratio of indebtedness to net capital		0.47
Maximum borrowing capacity		$ 300,000,000
Amounts outstanding		0
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 | Secured revolving credit facility, expiring June 2026
Short-term Debt [Line Items]
Maximum borrowing capacity		0
DT Midstream | Secured revolving credit facility, expiring June 2026
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 750,000,000
DTE Energy
Short-term Debt [Line Items]
Ratio of indebtedness to net capital		0.64
Maximum borrowing capacity		$ 1,932,000,000
Amounts outstanding		299,000,000
DTE Energy | Revolving credit facility
Short-term Debt [Line Items]
Amounts outstanding		69,000,000
DTE Energy | Letters of credit
Short-term Debt [Line Items]
Amounts outstanding		230,000,000
DTE Energy | Demand financing agreement
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement		300,000,000
Amount outstanding		18,000,000	$ 49,000,000
DTE Energy | Secured revolving credit facility, expiring June 2026
Short-term Debt [Line Items]
Maximum borrowing capacity		33,000,000
DTE Energy | Secured revolving credit facility, expiring June 2026 | Revolving credit facility
Short-term Debt [Line Items]
Maximum borrowing capacity		25,000,000
DTE Energy | Secured revolving credit facility, expiring June 2026 | Letters of credit
Short-term Debt [Line Items]
Maximum borrowing capacity		8,000,000
DTE Energy | Other outstanding letters of credit | Letters of credit
Short-term Debt [Line Items]
Amounts outstanding		9,000,000
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
Maximum | Forecast
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.70