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Fair Value Measurements (Fair Value Measurements Using Significant Unobservable Inputs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Commodity Contracts Derivative Assets and (Liabilities), net [Member]    
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance, January 1 $ 29 $ 29
Total net gains (losses) included in changes in net assets (realized/unrealized) (18) 6
Purchases 79 21
Sales (2) (1)
Settlements (69) (26)
Ending balance, December 31 19 29
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at December 31 (18) 6
Commodity Contracts Derivative Assets and (Liabilities), net [Member] | IPL [Member]    
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance, January 1 18 26
Total net gains (losses) included in changes in net assets (realized/unrealized) (12) (3)
Purchases 58 16
Sales (1) (1)
Settlements (47) (20)
Ending balance, December 31 16 18
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at December 31 (13) (3)
Commodity Contracts Derivative Assets and (Liabilities), net [Member] | WPL [Member]    
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance, January 1 11 3
Total net gains (losses) included in changes in net assets (realized/unrealized) (6) 9
Purchases 21 5
Sales (1) 0
Settlements (22) (6)
Ending balance, December 31 3 11
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at December 31 (5) 9
Deferred Proceeds [Member]    
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance, January 1 214 188
Total net gains (losses) included in changes in net assets (realized/unrealized) 0 0
Purchases 0 0
Sales 0 0
Settlements (29) 26
Ending balance, December 31 185 214
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at December 31 0 0
Deferred Proceeds [Member] | IPL [Member]    
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance, January 1 214 188
Total net gains (losses) included in changes in net assets (realized/unrealized) 0 0
Purchases 0 0
Sales 0 0
Settlements (29) 26
Ending balance, December 31 185 214
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at December 31 $ 0 $ 0