Property, Plant, and Equipment (Capitalized Software) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant, and Equipment [Line Items]
Amortization expense of capitalized software	$ 129	$ 123	$ 108
Gross carrying value of capitalized software	866	906
Accumulated amortization of capitalized software	432	520
DTE Electric
Property, Plant, and Equipment [Line Items]
Amortization expense of capitalized software	118	112	$ 101
Gross carrying value of capitalized software	756	811
Accumulated amortization of capitalized software	$ 363	$ 462

For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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Amount of expense for amortization of capitalized computer software costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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-Topic 985
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-Section 50
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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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