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Fair Value Measurements (Fair Value Measurements) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Assets:    
Money market fund investments $ 334 $ 32
Deferred proceeds 248 214
Liabilities:    
Long-term debt (incl. current maturities) 7,474 8,330
IPL [Member]    
Assets:    
Money market fund investments 39 32
Deferred proceeds 248 214
Liabilities:    
Long-term debt (incl. current maturities) 3,228 4,124
WPL [Member]    
Assets:    
Money market fund investments 295 0
Liabilities:    
Long-term debt (incl. current maturities) 2,778 2,862
Commodity Contracts [Member]    
Assets:    
Derivatives 360 176
Liabilities:    
Derivatives 98 9
Commodity Contracts [Member] | IPL [Member]    
Assets:    
Derivatives 202 84
Liabilities:    
Derivatives 66 4
Commodity Contracts [Member] | WPL [Member]    
Assets:    
Derivatives 158 92
Liabilities:    
Derivatives 32 5
Level 1 [Member]    
Assets:    
Money market fund investments 334 32
Deferred proceeds 0 0
Liabilities:    
Long-term debt (incl. current maturities) 0 0
Level 1 [Member] | IPL [Member]    
Assets:    
Money market fund investments 39 32
Deferred proceeds 0 0
Liabilities:    
Long-term debt (incl. current maturities) 0 0
Level 1 [Member] | WPL [Member]    
Assets:    
Money market fund investments 295 0
Liabilities:    
Long-term debt (incl. current maturities) 0 0
Level 1 [Member] | Commodity Contracts [Member]    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Level 1 [Member] | Commodity Contracts [Member] | IPL [Member]    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Level 1 [Member] | Commodity Contracts [Member] | WPL [Member]    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Level 2 [Member]    
Assets:    
Money market fund investments 0 0
Deferred proceeds 0 0
Liabilities:    
Long-term debt (incl. current maturities) 7,473 8,329
Level 2 [Member] | IPL [Member]    
Assets:    
Money market fund investments 0 0
Deferred proceeds 0 0
Liabilities:    
Long-term debt (incl. current maturities) 3,228 4,124
Level 2 [Member] | WPL [Member]    
Assets:    
Money market fund investments 0 0
Liabilities:    
Long-term debt (incl. current maturities) 2,778 2,862
Level 2 [Member] | Commodity Contracts [Member]    
Assets:    
Derivatives 295 146
Liabilities:    
Derivatives 78 8
Level 2 [Member] | Commodity Contracts [Member] | IPL [Member]    
Assets:    
Derivatives 150 65
Liabilities:    
Derivatives 47 3
Level 2 [Member] | Commodity Contracts [Member] | WPL [Member]    
Assets:    
Derivatives 145 81
Liabilities:    
Derivatives 31 5
Level 3 [Member]    
Assets:    
Money market fund investments 0 0
Deferred proceeds 248 214
Liabilities:    
Long-term debt (incl. current maturities) 1 1
Level 3 [Member] | IPL [Member]    
Assets:    
Money market fund investments 0 0
Deferred proceeds 248 214
Liabilities:    
Long-term debt (incl. current maturities) 0 0
Level 3 [Member] | WPL [Member]    
Assets:    
Money market fund investments 0 0
Liabilities:    
Long-term debt (incl. current maturities) 0 0
Level 3 [Member] | Commodity Contracts [Member]    
Assets:    
Derivatives 65 30
Liabilities:    
Derivatives 20 1
Level 3 [Member] | Commodity Contracts [Member] | IPL [Member]    
Assets:    
Derivatives 52 19
Liabilities:    
Derivatives 19 1
Level 3 [Member] | Commodity Contracts [Member] | WPL [Member]    
Assets:    
Derivatives 13 11
Liabilities:    
Derivatives 1 0
Carrying Amount [Member]    
Assets:    
Money market fund investments 334 32
Deferred proceeds 248 214
Liabilities:    
Long-term debt (incl. current maturities) 8,228 7,368
Carrying Amount [Member] | IPL [Member]    
Assets:    
Money market fund investments 39 32
Deferred proceeds 248 214
Liabilities:    
Long-term debt (incl. current maturities) 3,645 3,643
Carrying Amount [Member] | WPL [Member]    
Assets:    
Money market fund investments 295 0
Liabilities:    
Long-term debt (incl. current maturities) 3,019 2,429
Carrying Amount [Member] | Commodity Contracts [Member]    
Assets:    
Derivatives 360 176
Liabilities:    
Derivatives 98 9
Carrying Amount [Member] | Commodity Contracts [Member] | IPL [Member]    
Assets:    
Derivatives 202 84
Liabilities:    
Derivatives 66 4
Carrying Amount [Member] | Commodity Contracts [Member] | WPL [Member]    
Assets:    
Derivatives 158 92
Liabilities:    
Derivatives $ 32 $ 5