XML 127 R95.htm IDEA: XBRL DOCUMENT v3.22.0.1
Asset Retirement Obligations (Rollforward) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset retirement obligations at January 1 $ 2,829 $ 2,656 $ 2,463
Accretion 167 156 148
Liabilities incurred 28 24 11
Liabilities settled (30) (13) (17)
Revision in estimated cash flows 168 6 51
Asset retirement obligations at December 31 3,162 2,829 2,656
DTE Electric      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset retirement obligations at January 1 2,607 2,447 2,271
Accretion 155 145 138
Liabilities incurred 29 18 1
Liabilities settled (27) (8) (14)
Revision in estimated cash flows 168 5 51
Asset retirement obligations at December 31 $ 2,932 $ 2,607 $ 2,447