Retirement Benefits and Trusteed Assets (Pension Plan - Contributions to DTE Energy Company Affiliates Employee Benefit Plans Master Trust) (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Mar. 05, 2019	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2019
Defined Contribution Plan Disclosure [Line Items]
Price per Share (in dollars per share)				$ 126.00
Amount		$ 100	$ 175
Pension Plan
Defined Contribution Plan Disclosure [Line Items]
Number of Shares (in shares)	814,597
Price per Share (in dollars per share)	$ 122.76
Amount	$ 100