Significant Accounting Policies (Details Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Significant Accounting Policies [Line Items]
Reclassification of stranded tax effects resulting from the TCJA		$ 0
Unbilled revenues	$ 1,665,000,000	1,642,000,000
Specific review of probable future collections based on receivable balances, threshold duration	30 days
Uncollectible expense adjusted for regulatory deferrals	$ 103,000,000	111,000,000	$ 140,000,000
Past due financing receivables	0
Intangible assets amortization expense	71,000,000	33,000,000	27,000,000
Excise and sales taxes net impact on statement of operations	0
Charitable contributions	20,000,000	0	22,000,000
Retained Earnings
Significant Accounting Policies [Line Items]
Reclassification of stranded tax effects resulting from the TCJA		25,000,000
Accumulated Other Comprehensive Income (Loss)
Significant Accounting Policies [Line Items]
Reclassification of stranded tax effects resulting from the TCJA		(25,000,000)
Natural gas inventory
Significant Accounting Policies [Line Items]
LIFO inventory amount	40,000,000	40,000,000
Excess of replacement costs over stated LIFO value	$ 62,000,000	49,000,000
Minimum
Significant Accounting Policies [Line Items]
Notes receivable considered delinquent period	60 days
Maximum
Significant Accounting Policies [Line Items]
Notes receivable considered delinquent period	120 days
DTE Electric and DTE Gas
Significant Accounting Policies [Line Items]
Receivables due date	21 days
Threshold period past due for write-off of trade accounts receivable	150 days
DTE Electric
Significant Accounting Policies [Line Items]
Unbilled revenues	$ 763,000,000	729,000,000
Uncollectible expense adjusted for regulatory deferrals	62,000,000	65,000,000	$ 85,000,000
DTE Gas | COVID-19 Pandemic
Significant Accounting Policies [Line Items]
Uncollectible expense deferred as a Regulatory asset	2,000,000
Unbilled revenues
Significant Accounting Policies [Line Items]
Unbilled revenues	944,000,000	855,000,000
Unbilled revenues | DTE Electric
Significant Accounting Policies [Line Items]
Unbilled revenues	$ 260,000,000	$ 263,000,000