Supplementary Quarterly Financial Information (Unaudited ) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

DTE Energy

Quarterly earnings per share may not equal full year totals, since quarterly computations are based on weighted average common shares outstanding during each quarter.

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Year
	(In millions, except per share amounts)
2018
Operating Revenues	$	3,753	$	3,159	$	3,550	$	3,750	$	14,212
Operating Income	$	504	$	329	$	429	$	332	$	1,594
Net Income Attributable to DTE Energy Company	$	361	$	234	$	334	$	191	$	1,120
Basic Earnings per Share	$	2.01	$	1.29	$	1.84	$	1.05	$	6.18
Diluted Earnings per Share	$	2.00	$	1.29	$	1.84	$	1.05	$	6.17
2017
Operating Revenues	$	3,236	$	2,855	$	3,245	$	3,271	$	12,607
Operating Income(a)	$	585	$	320	$	434	$	372	$	1,711
Net Income Attributable to DTE Energy Company(b)	$	400	$	177	$	270	$	287	$	1,134
Basic Earnings per Share	$	2.23	$	0.99	$	1.51	$	1.60	$	6.32
Diluted Earnings per Share	$	2.23	$	0.99	$	1.51	$	1.60	$	6.32

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(a) Pursuant to the implementation of ASU 2017-07, amounts previously included in Operating Income — Operation and maintenance were reclassified to Other (Income) and Deductions — Non-operating retirement benefits, net on DTE Energy's Consolidated Statements of Operations.

(b) Includes a net Income Tax Benefit of $(105) million related to the enactment of the TCJA in the fourth quarter.

DTE Electric

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Year
	(In millions)
2018
Operating Revenues	$	1,205	$	1,276	$	1,521	$	1,296	$	5,298
Operating Income	$	253	$	269	$	444	$	168	$	1,134
Net Income	$	140	$	163	$	305	$	56	$	664
2017
Operating Revenues	$	1,175	$	1,218	$	1,434	$	1,275	$	5,102
Operating Income	$	217	$	272	$	395	$	281	$	1,165
Net Income	$	106	$	138	$	219	$	138	$	601