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Fair Value Measurements (Fair Value Measurements Using Significant Unobservable Inputs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
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 $ 21
Total net gains (losses) included in changes in net assets (realized/unrealized) 6 11
Purchases 21 14
Sales (1) (1)
Settlements (26) (16)
Ending balance, December 31 29 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 6 11
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 26 18
Total net gains (losses) included in changes in net assets (realized/unrealized) (3) 10
Purchases 16 11
Sales (1) (1)
Settlements (20) (12)
Ending balance, December 31 18 26
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 (3) 10
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 3 3
Total net gains (losses) included in changes in net assets (realized/unrealized) 9 1
Purchases 5 3
Settlements (6) (4)
Ending balance, December 31 11 3
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 9 1
Deferred Proceeds [Member]    
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance, January 1 188 188
Total net gains (losses) included in changes in net assets (realized/unrealized) 0 0
Purchases 0 0
Sales 0 0
Settlements 26 0
Ending balance, December 31 214 188
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 1 188 188
Total net gains (losses) included in changes in net assets (realized/unrealized) 0 0
Purchases 0 0
Sales 0 0
Settlements 26 0
Ending balance, December 31 214 188
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