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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2019
Asset Retirement Obligation [Abstract]  
Schedule of Asset Retirement Obligations
The following table presents the AROs recorded on the Condensed Consolidated Balance Sheets.
 
March 31, 2019
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Decommissioning of nuclear power facilities(a)
$
5,753

 
$
2,368

 
$
3,239

 
$
2,709

 
$
530

 
$
—

 
$
—

 
$
—

Closure of ash impoundments
6,961

 
3,013

 
3,197

 
3,177

 
20

 
52

 
699

 
—

Other
321

 
47

 
70

 
37

 
33

 
41

 
20

 
19

Total ARO
$
13,035

 
$
5,428

 
$
6,506

 
$
5,923

 
$
583

 
$
93

 
$
719

 
$
19

Less: current portion
779

 
209

 
456

 
452

 
4

 
6

 
108

 
—

Total noncurrent ARO
$
12,256


$
5,219


$
6,050


$
5,471


$
579


$
87


$
611

 
$
19

(a)    Duke Energy amount includes purchase accounting adjustments related to the merger with Progress Energy.
Schedule of Change in Asset Retirement Obligation
The following table presents the change in liability associated with AROs for the Duke Energy Registrants.
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Balance at December 31, 2018(a)
$
10,467

 
$
3,949

 
$
5,411

 
$
4,820

 
$
591

 
$
93

 
$
722

 
$
19

Accretion expense(b)
110

 
48

 
57

 
50

 
7

 
1

 
7

 
—

Liabilities settled(c)
(184
)
 
(76
)
 
(97
)
 
(82
)
 
(15
)
 
(1
)
 
(10
)
 
—

Revisions in estimates of cash flows(d)
2,642

 
1,507

 
1,135

 
1,135

 
—

 
—

 
—

 
—

Balance at March 31, 2019
$
13,035

 
$
5,428

 
$
6,506

 
$
5,923

 
$
583

 
$
93

 
$
719

 
$
19

(a)
Primarily relates to decommissioning nuclear power facilities, closure of ash impoundments, asbestos removal, closure of landfills at fossil generation facilities, retirement of natural gas mains and removal of renewable energy generation assets.
(b)
For the three months ended March 31, 2019, substantially all accretion expense relates to Duke Energy's regulated operations and has been deferred in accordance with regulatory accounting treatment.
(c)
Primarily relates to ash impoundment closures.
(d)
Relates to increases in closure estimates for certain ash impoundments as a result of the NCDEQ's determination that all ash basins must be excavated. See Note 4 for more information. The incremental amount recorded represents the discounted cash flows for estimated closure costs based upon the probability weightings of the potential closure methods as evaluated on a site-by-site basis.
Public Utilities General Disclosures
(in millions)
March 31, 2019
 
December 31, 2018
Duke Energy
$
6,102

 
$
5,579

Duke Energy Carolinas
3,443

 
3,133

Duke Energy Progress
2,659

 
2,446