Long-Term Debt (Scheduled Debt Maturities) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Maturities of Long-term Debt [Abstract]
2019	$ 1,495
2020	682
2021	462
2022	616
2023	1,177
2024 and Thereafter	9,314
Long-term debt, total	13,746
DTE Electric
Maturities of Long-term Debt [Abstract]
2019	0
2020	632
2021	462
2022	316
2023	202
2024 and Thereafter	4,978
Long-term debt, total	$ 6,590

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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