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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]  
Net Periodic Benefit Costs The components of net periodic benefit costs for sponsored defined benefit pension and OPEB plans for the three months ended March 31 are included below (in millions). For IPL and WPL, amounts are for their plan participants covered under plans they sponsor, as well as amounts directly assigned to them related to certain participants in the Alliant Energy and Corporate Services sponsored plans.
Defined Benefit Pension PlansOPEB Plans
Alliant Energy2022202120222021
Service cost$2$3$1$1
Interest cost9811
Expected return on plan assets(17)(17)(1)(1)
Amortization of actuarial loss81011
$2$4$2$2
Defined Benefit Pension PlansOPEB Plans
IPL2022202120222021
Service cost$2$2$—$—
Interest cost4411
Expected return on plan assets(8)(8)(1)(1)
Amortization of actuarial loss34——
$1$2$—$—
Defined Benefit Pension PlansOPEB Plans
WPL2022202120222021
Service cost$1$1$—$—
Interest cost441—
Expected return on plan assets(8)(8)——
Amortization of actuarial loss45—1
$1$2$1$1
Recognized Compensation Expense And Income Tax Benefits A summary of compensation expense, including amounts allocated to IPL and WPL, and the related income tax benefits recognized for share-based compensation awards for the three months ended March 31 was as follows (in millions):
Alliant EnergyIPLWPL
202220212022202120222021
Compensation expense$4$3$2$1$2$1
Income tax benefits111———
Schedule Of Equity-based Compensation Plans Activity
For the three months ended March 31, 2022, performance shares, performance restricted stock units and restricted stock units were granted to key employees as follows. These shares and units will be paid out in shares of common stock, and are therefore accounted for as equity awards.
Weighted Average
GrantsGrant Date Fair Value
Performance shares70,240$54.45
Performance restricted stock units80,25256.62
Restricted stock units74,36056.62
IPL [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Net Periodic Benefit Costs The components of net periodic benefit costs for sponsored defined benefit pension and OPEB plans for the three months ended March 31 are included below (in millions). For IPL and WPL, amounts are for their plan participants covered under plans they sponsor, as well as amounts directly assigned to them related to certain participants in the Alliant Energy and Corporate Services sponsored plans.
Defined Benefit Pension PlansOPEB Plans
Alliant Energy2022202120222021
Service cost$2$3$1$1
Interest cost9811
Expected return on plan assets(17)(17)(1)(1)
Amortization of actuarial loss81011
$2$4$2$2
Defined Benefit Pension PlansOPEB Plans
IPL2022202120222021
Service cost$2$2$—$—
Interest cost4411
Expected return on plan assets(8)(8)(1)(1)
Amortization of actuarial loss34——
$1$2$—$—
Defined Benefit Pension PlansOPEB Plans
WPL2022202120222021
Service cost$1$1$—$—
Interest cost441—
Expected return on plan assets(8)(8)——
Amortization of actuarial loss45—1
$1$2$1$1
Recognized Compensation Expense And Income Tax Benefits A summary of compensation expense, including amounts allocated to IPL and WPL, and the related income tax benefits recognized for share-based compensation awards for the three months ended March 31 was as follows (in millions):
Alliant EnergyIPLWPL
202220212022202120222021
Compensation expense$4$3$2$1$2$1
Income tax benefits111———
Schedule Of Equity-based Compensation Plans Activity
For the three months ended March 31, 2022, performance shares, performance restricted stock units and restricted stock units were granted to key employees as follows. These shares and units will be paid out in shares of common stock, and are therefore accounted for as equity awards.
Weighted Average
GrantsGrant Date Fair Value
Performance shares70,240$54.45
Performance restricted stock units80,25256.62
Restricted stock units74,36056.62
WPL [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Net Periodic Benefit Costs The components of net periodic benefit costs for sponsored defined benefit pension and OPEB plans for the three months ended March 31 are included below (in millions). For IPL and WPL, amounts are for their plan participants covered under plans they sponsor, as well as amounts directly assigned to them related to certain participants in the Alliant Energy and Corporate Services sponsored plans.
Defined Benefit Pension PlansOPEB Plans
Alliant Energy2022202120222021
Service cost$2$3$1$1
Interest cost9811
Expected return on plan assets(17)(17)(1)(1)
Amortization of actuarial loss81011
$2$4$2$2
Defined Benefit Pension PlansOPEB Plans
IPL2022202120222021
Service cost$2$2$—$—
Interest cost4411
Expected return on plan assets(8)(8)(1)(1)
Amortization of actuarial loss34——
$1$2$—$—
Defined Benefit Pension PlansOPEB Plans
WPL2022202120222021
Service cost$1$1$—$—
Interest cost441—
Expected return on plan assets(8)(8)——
Amortization of actuarial loss45—1
$1$2$1$1
Recognized Compensation Expense And Income Tax Benefits A summary of compensation expense, including amounts allocated to IPL and WPL, and the related income tax benefits recognized for share-based compensation awards for the three months ended March 31 was as follows (in millions):
Alliant EnergyIPLWPL
202220212022202120222021
Compensation expense$4$3$2$1$2$1
Income tax benefits111———
Schedule Of Equity-based Compensation Plans Activity
For the three months ended March 31, 2022, performance shares, performance restricted stock units and restricted stock units were granted to key employees as follows. These shares and units will be paid out in shares of common stock, and are therefore accounted for as equity awards.
Weighted Average
GrantsGrant Date Fair Value
Performance shares70,240$54.45
Performance restricted stock units80,25256.62
Restricted stock units74,36056.62