Long-Term Debt (Debt Redemptions) (Details) - USD ($) $ in Millions	1 Months Ended						3 Months Ended	12 Months Ended
	Dec. 31, 2021	Aug. 31, 2021	Jul. 31, 2021	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument, Redemption [Line Items]
Amount							$ 2,600	$ 3,522	$ 882	$ 821
Loss on extinguishment of debt							376	393	6	0
Junior Subordinated Debentures
Debt Instrument, Redemption [Line Items]
Loss on extinguishment of debt								$ 17
Junior Subordinated Debentures | 5.375% Junior Subordinated Debentures Maturing in 2076
Debt Instrument, Redemption [Line Items]
Interest Rate				5.375%
Amount				$ 300
Loss on extinguishment of debt				$ 8
Junior Subordinated Debentures | 2016, 6.00% Junior Subordinated Debentures Maturing in 2076
Debt Instrument, Redemption [Line Items]
Interest Rate	6.00%							6.00%
Amount	$ 280
Loss on extinguishment of debt	$ 9
Senior Notes
Debt Instrument, Redemption [Line Items]
Amount							$ 2,600
Senior Notes | 3.30% Senior Notes Maturing in 2022
Debt Instrument, Redemption [Line Items]
Interest Rate			3.30%
Amount			$ 300
Senior Notes | 2.60% Senior Notes Maturing in 2022
Debt Instrument, Redemption [Line Items]
Interest Rate			2.60%
Amount			$ 300
Senior Notes | 3.70% Senior Notes Maturing in2023
Debt Instrument, Redemption [Line Items]
Interest Rate			3.70%
Amount			$ 600
Senior Notes | 3.85% Senior Notes Maturing in 2023
Debt Instrument, Redemption [Line Items]
Interest Rate		3.85%	3.85%
Amount		$ 165	$ 135
Senior Notes | 3.50% Senior Notes Maturing in 2024
Debt Instrument, Redemption [Line Items]
Interest Rate			3.50%
Amount			$ 350
Senior Notes | 3.80% Senior Notes Maturing in 2027
Debt Instrument, Redemption [Line Items]
Interest Rate			3.80%
Amount			$ 350
Senior Notes | 3.40% Senior Notes Maturing in 2029
Debt Instrument, Redemption [Line Items]
Interest Rate			3.40%
Amount			$ 21
Senior Notes | 6.375% Senior Notes Maturing in 2033
Debt Instrument, Redemption [Line Items]
Interest Rate		6.375%	6.375%
Amount		$ 209	$ 191
DTE Electric
Debt Instrument, Redemption [Line Items]
Amount								$ 321	$ 632	$ 0
DTE Electric | Mortgage Bonds | 3.90% Mortgage Bonds Maturing in 2021
Debt Instrument, Redemption [Line Items]
Interest Rate						3.90%
Amount						$ 250
DTE Electric | Mortgage Bonds | 7.00% Mortgage Bonds Maturing in 2021
Debt Instrument, Redemption [Line Items]
Interest Rate					7.00%
Amount					$ 33
DTE Electric | Mortgage Bonds | 6.90% Senior Notes Maturing in 2021
Debt Instrument, Redemption [Line Items]
Interest Rate		6.90%
Amount		$ 38