Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Doubtful Accounts (shown as deduction from Accounts receivable in DTE Energy's Consolidated Statements of Financial Position)
Balance at Beginning of Period	$ 91
Additions:
Balance at End of Period	104	$ 91
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	46
Additions:
Balance at End of Period	57	46
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	91	91	$ 49
Additions:
Charged to costs and expenses	103	111	140
Charged to other accounts	50	56	55
Deductions	(140)	(167)	(153)
Balance at End of Period	104	91	91
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	46	53	31
Additions:
Charged to costs and expenses	61	65	85
Charged to other accounts	30	36	36
Deductions	(80)	(108)	(99)
Balance at End of Period	$ 57	$ 46	$ 53