Short-Term Credit Arrangements and Borrowings (Details) (USD $)	Dec. 31, 2014
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,025,000,000
Amounts outstanding	602,000,000
Net availability	1,423,000,000
DTE Energy [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,425,000,000
Amounts outstanding	407,000,000
Net availability	1,018,000,000
DTE Electric [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300,000,000
Amounts outstanding	50,000,000
Net availability	250,000,000
DTE Gas [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300,000,000
Amounts outstanding	145,000,000
Net availability	155,000,000
Letter of Credit [Member]
Line Of Credit Facility [Line Items]
Amounts outstanding	204,000,000
Letter of Credit [Member] | DTE Energy [Member]
Line Of Credit Facility [Line Items]
Amounts outstanding	204,000,000
Letter of Credit [Member] | DTE Electric [Member]
Line Of Credit Facility [Line Items]
Amounts outstanding	0
Letter of Credit [Member] | DTE Gas [Member]
Line Of Credit Facility [Line Items]
Amounts outstanding	0
Letter of Credit [Member] | Unsecured letter of credit, expiring in February 2015 [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100,000,000
Letter of Credit [Member] | Unsecured letter of credit, expiring in February 2015 [Member] | DTE Energy [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100,000,000
Letter of Credit [Member] | Unsecured letter of credit, expiring in February 2015 [Member] | DTE Electric [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit [Member] | Unsecured letter of credit, expiring in February 2015 [Member] | DTE Gas [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit [Member] | Unsecured letter of credit, expiring in August 2015 [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	125,000,000
Letter of Credit [Member] | Unsecured letter of credit, expiring in August 2015 [Member] | DTE Energy [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	125,000,000
Letter of Credit [Member] | Unsecured letter of credit, expiring in August 2015 [Member] | DTE Electric [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit [Member] | Unsecured letter of credit, expiring in August 2015 [Member] | DTE Gas [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	0
Revolving Credit Facility [Member] | Unsecured revolving credit facility, expiring April 2018 [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,800,000,000
Revolving Credit Facility [Member] | Unsecured revolving credit facility, expiring April 2018 [Member] | DTE Energy [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,200,000,000
Revolving Credit Facility [Member] | Unsecured revolving credit facility, expiring April 2018 [Member] | DTE Electric [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300,000,000
Revolving Credit Facility [Member] | Unsecured revolving credit facility, expiring April 2018 [Member] | DTE Gas [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300,000,000
Commercial Paper [Member]
Line Of Credit Facility [Line Items]
Amounts outstanding	398,000,000
Commercial Paper [Member] | DTE Energy [Member]
Line Of Credit Facility [Line Items]
Amounts outstanding	203,000,000
Commercial Paper [Member] | DTE Electric [Member]
Line Of Credit Facility [Line Items]
Amounts outstanding	50,000,000
Commercial Paper [Member] | DTE Gas [Member]
Line Of Credit Facility [Line Items]
Amounts outstanding	$ 145,000,000