Long-Term Financings (Debt Maturities) (Details) $ in Millions	Dec. 31, 2025 USD ($)
Maturities of Long-term Debt [Abstract]
2026	$ 1,352
2027	1,730
2028	1,987
2029	1,962
2030	2,504
2031 and Thereafter	15,771
Total	25,306
DTE Electric
Maturities of Long-term Debt [Abstract]
2026	752
2027	339
2028	617
2029	103
2030	829
2031 and Thereafter	10,622
Total	$ 13,262