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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations

(PPL)

WPD has recorded conditional AROs required by U.K. law related to treated wood poles, gas-filled switchgear and fluid-filled cables.

(PPL and PPL Electric)

PPL Electric has identified legal retirement obligations for the retirement of certain transmission assets that could not be reasonably estimated due to indeterminable settlement dates. These assets are located on rights-of-way that allow the grantor to require PPL Electric to relocate or remove the assets. Since this option is at the discretion of the grantor of the right-of-way, PPL Electric is unable to determine when these events may occur.

(PPL, LKE, LG&E and KU)

PPL's LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 13 for information on the CCR rule. LG&E also has AROs related to natural gas mains and wells. LG&E's and KU's transmission and distribution lines largely operate under perpetual property easement agreements, which do not generally require restoration upon removal of the property. Therefore, no material AROs are recorded for transmission and distribution assets. For LKE, LG&E and KU, all ARO accretion and depreciation expenses are reclassified as a regulatory asset. For other AROs, at the time of retirement, the related ARO regulatory asset is offset against the associated cost of removal regulatory liability, PP&E and ARO liability.

The changes in the carrying amounts of AROs were as follows:
 
PPL
 
LKE
 
LG&E
 
KU
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
ARO at beginning of period
$
347

 
$
397

 
$
296

 
$
356

 
$
103

 
$
121

 
$
193

 
$
235

Accretion
19

 
20

 
17

 
18

 
6

 
6

 
11

 
12

Obligations incurred
—

 
8

 
—

 
8

 
—

 
—

 
—

 
8

Changes in estimated timing or cost
12

 
(3
)
 
(2
)
 
(14
)
 
(2
)
 
(2
)
 
—

 
(12
)
Effect of foreign currency exchange rates
—

 
(3
)
 
—

 
—

 
—

 
—

 
—

 
—

Obligations settled
(96
)
 
(72
)
 
(96
)
 
(72
)
 
(34
)
 
(22
)
 
(62
)
 
(50
)
ARO at end of period
$
282

 
$
347

 
$
215

 
$
296

 
$
73

 
$
103

 
$
142

 
$
193