Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts (shown as deduction from Accounts receivable in DTE Energy's Consolidated Statements of Financial Position)
Balance at Beginning of Period	$ 41
Additions:
Balance at End of Period	49	$ 41
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	25
Additions:
Balance at End of Period	31	25
Allowance for Doubtful Accounts
Allowance for Doubtful Accounts (shown as deduction from Accounts receivable in DTE Energy's Consolidated Statements of Financial Position)
Balance at Beginning of Period	41	49	$ 54
Additions:
Charged to costs and expenses	80	78	93
Charged to other accounts	26	18	14
Deductions	(98)	(104)	(112)
Balance at End of Period	49	41	49
Allowance for Doubtful Accounts | 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	25	28	29
Additions:
Charged to costs and expenses	55	49	51
Charged to other accounts	14	8	6
Deductions	(63)	(60)	(58)
Balance at End of Period	$ 31	$ 25	$ 28