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Short-Term Credit Arrangements and Borrowings (Tables)
3 Months Ended
Mar. 31, 2018
Short-term Debt [Abstract]  
Schedule of Line of Credit Facilities
The availability under the facilities in place at March 31, 2018 is shown in the following table:
 
DTE Energy
 
DTE Electric
 
DTE Gas
 
Total
 
(In millions)
Unsecured letter of credit facility, expiring in February 2019
$
150

 
$

 
$

 
$
150

Unsecured letter of credit facility, expiring in September 2019
70

 

 

 
70

Unsecured revolving credit facility, expiring April 2022
1,200

 
400

 
300

 
1,900

 
1,420

 
400

 
300

 
2,120

Amounts outstanding at March 31, 2018
 
 
 
 
 
 
 
Commercial paper issuances

 
380

 
255

 
635

Letters of credit
221

 

 

 
221

 
221

 
380

 
255

 
856

Net availability at March 31, 2018
$
1,199

 
$
20

 
$
45

 
$
1,264