Long-Term Debt (Scheduled Interest Payments) (Details) $ in Millions	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
2022	$ 575
2023	548
2024	529
2025	494
2026	450
2027 and Thereafter	7,510
Total	10,106
DTE Electric
Debt Instrument [Line Items]
2022	330
2023	322
2024	305
2025	292
2026	284
2027 and Thereafter	4,222
Total	$ 5,755