Long-Term Debt (Details) $ / shares in Units, shares in Millions			1 Months Ended	12 Months Ended
	Jan. 01, 2017 $ / shares	Oct. 05, 2016 USD ($)	Oct. 31, 2016 USD ($) day $ / shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)	Oct. 31, 2019 shares
Debt Instrument [Line Items]
Face amount				$ 1,420,000,000
Junior subordinated debentures				1,145,000,000	$ 756,000,000
Equity units, percentage interest in attached debt instrument			0.005%
Financial instruments subject to mandatory redemption, settlement terms, share value, amount					$ 98,000,000
Junior subordinated debentures
Debt Instrument [Line Items]
Junior subordinated debentures				$ 1,180,000,000
Interest rate				5.50%
5.25% junior subordinated debentures due 2062 | Junior subordinated debentures
Debt Instrument [Line Items]
Interest rate				5.25%
Junior subordinated debentures				$ 200,000,000
May 5.375% junior subordinated debentures maturing in 2076 | Junior subordinated debentures
Debt Instrument [Line Items]
Interest rate				5.375%
Junior subordinated debentures				$ 300,000,000
6% junior subordinated debentures maturing 2076 | Junior subordinated debentures
Debt Instrument [Line Items]
Interest rate				6.00%
Junior subordinated debentures				$ 280,000,000
5.25% junior subordinated debentures due 2077 | Junior subordinated debentures
Debt Instrument [Line Items]
Interest rate				5.25%
Junior subordinated debentures				$ 400,000,000
October series C 1.5% RSNs maturing 2024 | Other long-term debt
Debt Instrument [Line Items]
Interest rate		1.50%	1.50%
Face amount		$ 675,000,000	$ 675,000,000
October series D 1.50% senior notes maturing 2019 | Other long-term debt
Debt Instrument [Line Items]
Interest rate			1.50%
Face amount			$ 400,000,000
October series E 2.85% senior notes maturing 2026 | Other long-term debt
Debt Instrument [Line Items]
Interest rate			2.85%
Face amount			$ 600,000,000
Unsuccessful remarketing | October series C 1.5% RSNs maturing 2024 | Other long-term debt
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Equity units subject to mandatory redemption
Debt Instrument [Line Items]
Forward contract indexed to issuer's equity, forward rate per share (in dollars per share) | $ / shares	$ 50
Financial instruments subject to mandatory redemption, contract adjustment rate	5.00%	5.00%
Financial instruments subject to mandatory redemption, contract adjustment rate, annual amount (in dollars per share) | $ / shares	$ 2.50
Financial instruments subject to mandatory redemption, settlement terms, share value, amount				$ 98,000,000
Financial instruments subject to mandatory redemption, settlement terms, maximum number of shares (in shares) | shares				9.0
Equity units subject to mandatory redemption | Equal to or greater than $116.31, 0.4299 shares of common stock
Debt Instrument [Line Items]
Number of consecutive scheduled trading days | day			20
Financial instruments subject to mandatory redemption, anti-dilution provision, conversion ratio			0.4299
Equity units subject to mandatory redemption | Equal to or greater than $116.31, 0.4299 shares of common stock | Minimum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share) | $ / shares			$ 116.31
Equity units subject to mandatory redemption | Less than $116.31, but greater than $93.05, number of shares of common stock equal to $50 divided by the AMV rounded to the nearest 1/10,000th of a share | Minimum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share) | $ / shares			93.05
Equity units subject to mandatory redemption | Less than $116.31, but greater than $93.05, number of shares of common stock equal to $50 divided by the AMV rounded to the nearest 1/10,000th of a share | Maximum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share) | $ / shares			$ 116.31
Equity units subject to mandatory redemption | Less than or equal to $93.05, 0.5373 shares of common stock
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, conversion ratio			0.5373
Equity units subject to mandatory redemption | Less than or equal to $93.05, 0.5373 shares of common stock | Maximum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share) | $ / shares			$ 93.05
DTE Electric | Tax-exempt revenue bonds
Debt Instrument [Line Items]
Interest rate				4.30%
Scenario, Forecast | Equity units subject to mandatory redemption | Minimum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, settlement terms, number of shares (in shares) | shares						5.8
Scenario, Forecast | Equity units subject to mandatory redemption | Maximum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, settlement terms, number of shares (in shares) | shares						7.3