Long-Term Debt (Details) $ in Millions |
3 Months Ended |
|---|---|
|
Mar. 31, 2016
USD ($)
| |
| Debt Instrument [Line Items] | |
| Debt redemption amount | $ 11 |
| Mortgages | DTE Electric | March 2016 Mortgage Bonds 7.904% | |
| Debt Instrument [Line Items] | |
| Interest Rate | 7.904% |
| Debt redemption amount | $ 10 |
| Other Long-Term Debt | DTE Energy | |
| Debt Instrument [Line Items] | |
| Debt redemption amount | $ 1 |