Short-Term Credit Arrangements and Borrowings (Details)	Dec. 31, 2015 USD ($)
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,070,000,000
Amounts outstanding	629,000,000
Net availability	1,441,000,000
DTE Energy
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,370,000,000
Amounts outstanding	163,000,000
Net availability	1,207,000,000
DTE Electric
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	400,000,000
Amounts outstanding	272,000,000
Net availability	128,000,000
DTE Gas
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300,000,000
Amounts outstanding	194,000,000
Net availability	106,000,000
Letter of Credit
Line Of Credit Facility [Line Items]
Amounts outstanding	130,000,000
Letter of Credit | DTE Energy
Line Of Credit Facility [Line Items]
Amounts outstanding	130,000,000
Letter of Credit | DTE Electric
Line Of Credit Facility [Line Items]
Amounts outstanding	0
Letter of Credit | DTE Gas
Line Of Credit Facility [Line Items]
Amounts outstanding	0
Letter of Credit | Unsecured letter of credit facility, expiring in February 2017
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100,000,000
Letter of Credit | Unsecured letter of credit facility, expiring in February 2017 | DTE Energy
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100,000,000
Letter of Credit | Unsecured letter of credit facility, expiring in February 2017 | DTE Electric
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit | Unsecured letter of credit facility, expiring in February 2017 | DTE Gas
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit | Unsecured letter of credit facility, expiring in September 2017
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	70,000,000
Letter of Credit | Unsecured letter of credit facility, expiring in September 2017 | DTE Energy
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	70,000,000
Letter of Credit | Unsecured letter of credit facility, expiring in September 2017 | DTE Electric
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit | Unsecured letter of credit facility, expiring in September 2017 | DTE Gas
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0
Revolving Credit Facility | Unsecured revolving credit facility, expiring April 2020
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,900,000,000
Revolving Credit Facility | Unsecured revolving credit facility, expiring April 2020 | DTE Energy
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,200,000,000
Revolving Credit Facility | Unsecured revolving credit facility, expiring April 2020 | DTE Electric
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	400,000,000
Revolving Credit Facility | Unsecured revolving credit facility, expiring April 2020 | DTE Gas
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300,000,000
Commercial Paper
Line Of Credit Facility [Line Items]
Amounts outstanding	499,000,000
Commercial Paper | DTE Energy
Line Of Credit Facility [Line Items]
Amounts outstanding	33,000,000
Commercial Paper | DTE Electric
Line Of Credit Facility [Line Items]
Amounts outstanding	272,000,000
Commercial Paper | DTE Gas
Line Of Credit Facility [Line Items]
Amounts outstanding	$ 194,000,000