Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts (shown as deduction from Accounts receivable in DTE Energy's Consolidated Statements of Financial Position)
Balance at Beginning of Period	$ 49
Additions:
Balance at End of Period	91	$ 49
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	31
Additions:
Balance at End of Period	53	31
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	49	41	$ 49
Additions:
Charged to costs and expenses	140	80	78
Charged to other accounts	55	26	18
Deductions	(153)	(98)	(104)
Balance at End of Period	91	49	41
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	31	25	28
Additions:
Charged to costs and expenses	85	55	49
Charged to other accounts	36	14	8
Deductions	(99)	(63)	(60)
Balance at End of Period	$ 53	$ 31	$ 25