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Stock-Based Compensation (Performance Share Awards Compensation Expense) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation Expense Recorded [Line Items]      
Compensation expense $ 103dte_AllocatedSharebasedCompensationExpenseEquityandLiability $ 99dte_AllocatedSharebasedCompensationExpenseEquityandLiability $ 83dte_AllocatedSharebasedCompensationExpenseEquityandLiability
Performance Shares [Member]      
Compensation Expense Recorded [Line Items]      
Compensation expense 93dte_AllocatedSharebasedCompensationExpenseEquityandLiability
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 77dte_AllocatedSharebasedCompensationExpenseEquityandLiability
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 71dte_AllocatedSharebasedCompensationExpenseEquityandLiability
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Cash settlements 11dte_EmployeeServiceSharebasedCompensationCashFlowEffectCashUsedtoSettleEquityandLiabilityAwards
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 9dte_EmployeeServiceSharebasedCompensationCashFlowEffectCashUsedtoSettleEquityandLiabilityAwards
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 4dte_EmployeeServiceSharebasedCompensationCashFlowEffectCashUsedtoSettleEquityandLiabilityAwards
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Stock settlements $ 61dte_EmployeeServiceSharebasedCompensationStockUsedtoSettleAwards
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 $ 56dte_EmployeeServiceSharebasedCompensationStockUsedtoSettleAwards
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 $ 41dte_EmployeeServiceSharebasedCompensationStockUsedtoSettleAwards
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember