Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts (shown as deduction from Accounts receivable in DTE Energy's Consolidated Statements of Financial Position)
Balance at Beginning of Period	$ 54	$ 55	$ 62
Charged to costs and expenses	93	95	94
Charged to other accounts	14	20	23
Deductions	(112)	(116)	(124)
Balance at End of Period	49	54	55
DTE Electric
Allowance for Doubtful Accounts (shown as deduction from Accounts receivable in DTE Energy's Consolidated Statements of Financial Position)
Balance at Beginning of Period	29	28	35
Charged to costs and expenses	51	50	52
Charged to other accounts	6	10	11
Deductions	(58)	(59)	(70)
Balance at End of Period	$ 28	$ 29	$ 28