Derivative Instruments and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2021

Dec. 31, 2019

Derivative [Line Items]

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]

The following tables provide information on gains or losses recognized in AOCL for the cash flow hedges for the periods indicated:

	Interest Rate Hedges for the Year Ended December 31,
$ in thousands (net of tax)	2021		2020		2019
Beginning accumulated derivative loss in AOCL	$	(43,420)	$	(19,750)	$	—
Net gains / (losses) associated with current period hedging transactions	10,393		(27,779)		(19,750)
Net (gains) / losses reclassified to interest expense, net of tax	3,620		4,109		—
Ending accumulated derivative loss in AOCL	$	(29,407)	$	(43,420)	$	(19,750)
Loss expected to be reclassified to earnings in the next twelve months	$	(5,375)
Maximum length of time that we are hedging our exposure to variability in future cash flows related to forecasted transactions (in months)	33

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

			December 31,
Commodity	Hedging Designation	Balance sheet classification	2021		2020
Financial transmission rights	Not a Cash Flow Hedge	Prepayments and other current assets	$	1,235	$	543
Interest rate hedges	Cash Flow Hedge	Derivative liabilities, non-current	$	49,382	$	63,215

Schedule of Derivative Instruments [Table Text Block]

At December 31, 2021, AES Indiana's outstanding derivative instruments were as follows:

Commodity	Accounting Treatment (a)	Unit	Purchases (in thousands)		Sales (in thousands)		Net Purchases/(Sales) (in thousands)
Interest rate hedges	Designated	USD	$	400,000	$	—	$	400,000
FTRs	Not Designated	MWh	6,091		—		6,091

(a)    Refers to whether the derivative instruments have been designated as a cash flow hedge.

Subsidiaries [Member]

Derivative [Line Items]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

			December 31,
Commodity	Hedging Designation	Balance sheet classification	2021		2020
Financial transmission rights	Not a Cash Flow Hedge	Prepayments and other current assets	$	1,235	$	543

Schedule of Derivative Instruments [Table Text Block]

At December 31, 2021, AES Indiana's outstanding derivative instruments were as follows:

Commodity	Accounting Treatment (a)	Unit	Purchases (in thousands)	Sales (in thousands)	Net Purchases/(Sales) (in thousands)
FTRs	Not Designated	MWh	6,091	—	6,091

(a)    Refers to whether the derivative instruments have been designated as a cash flow hedge.