Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Basic Earnings per Share
Net Income Attributable to DTE Energy Company/DTE Electric	$ 273us-gaap_NetIncomeLoss	$ 326us-gaap_NetIncomeLoss
Average number of common shares outstanding (in shares)	178	177
Dividends declared — common shares	123us-gaap_DividendsCommonStock	116us-gaap_DividendsCommonStock
Dividends declared — net restricted shares	1us-gaap_DividendsShareBasedCompensation	0us-gaap_DividendsShareBasedCompensation
Total distributed earnings	124us-gaap_DistributedEarnings	116us-gaap_DistributedEarnings
Net income less distributed earnings	149us-gaap_UndistributedEarnings	210us-gaap_UndistributedEarnings
Distributed (dividends per common share) (dollars per share)	$ 0.69	$ 0.66
Undistributed (in dollars per share)	$ 0.84	$ 1.18
Total Basic Earnings per Common Share (dollars per share)	$ 1.53us-gaap_EarningsPerShareBasic	$ 1.84us-gaap_EarningsPerShareBasic
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company/DTE Electric	273us-gaap_NetIncomeLoss	326us-gaap_NetIncomeLoss
Average number of common shares outstanding (in shares)	178	177
Dividends declared — common shares	123us-gaap_DividendsCommonStock	116us-gaap_DividendsCommonStock
Dividends declared — net restricted shares	1us-gaap_DividendsShareBasedCompensation	0us-gaap_DividendsShareBasedCompensation
Total distributed earnings	124us-gaap_DistributedEarnings	116us-gaap_DistributedEarnings
Net income less distributed earnings	$ 149us-gaap_UndistributedEarningsDiluted	$ 210us-gaap_UndistributedEarningsDiluted
Distributed (dividends per common share) (dollars per share)	$ 0.69	$ 0.66
Undistributed (dollars per share)	$ 0.84	$ 1.18
Total Diluted Earnings per Common Share (dollars per share)	$ 1.53us-gaap_EarningsPerShareDiluted	$ 1.84us-gaap_EarningsPerShareDiluted

The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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