XML 129 R95.htm IDEA: XBRL DOCUMENT v3.22.4
Benefit Plans (Expected Benefit Payments) (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2023 $ 90
Expected benefit payments, 2024 89
Expected benefit payments, 2025 90
Expected benefit payments, 2026 91
Expected benefit payments, 2027 90
Expected benefit payments, 2028 - 2032 418
Defined Benefit Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2023 72
Expected benefit payments, 2024 71
Expected benefit payments, 2025 72
Expected benefit payments, 2026 74
Expected benefit payments, 2027 74
Expected benefit payments, 2028 - 2032 349
Other Postretirement Benefits Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2023 18
Expected benefit payments, 2024 18
Expected benefit payments, 2025 18
Expected benefit payments, 2026 17
Expected benefit payments, 2027 16
Expected benefit payments, 2028 - 2032 69
IPL [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2023 41
Expected benefit payments, 2024 40
Expected benefit payments, 2025 41
Expected benefit payments, 2026 40
Expected benefit payments, 2027 39
Expected benefit payments, 2028 - 2032 182
IPL [Member] | Defined Benefit Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2023 34
Expected benefit payments, 2024 33
Expected benefit payments, 2025 34
Expected benefit payments, 2026 33
Expected benefit payments, 2027 32
Expected benefit payments, 2028 - 2032 155
IPL [Member] | Other Postretirement Benefits Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2023 7
Expected benefit payments, 2024 7
Expected benefit payments, 2025 7
Expected benefit payments, 2026 7
Expected benefit payments, 2027 7
Expected benefit payments, 2028 - 2032 27
WPL [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2023 39
Expected benefit payments, 2024 38
Expected benefit payments, 2025 38
Expected benefit payments, 2026 38
Expected benefit payments, 2027 37
Expected benefit payments, 2028 - 2032 174
WPL [Member] | Defined Benefit Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2023 32
Expected benefit payments, 2024 31
Expected benefit payments, 2025 31
Expected benefit payments, 2026 31
Expected benefit payments, 2027 31
Expected benefit payments, 2028 - 2032 148
WPL [Member] | Other Postretirement Benefits Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2023 7
Expected benefit payments, 2024 7
Expected benefit payments, 2025 7
Expected benefit payments, 2026 7
Expected benefit payments, 2027 6
Expected benefit payments, 2028 - 2032 $ 26