XML 29 R38.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Fair Value (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Entity Information [Line Items]    
Investments, Fair Value Disclosure $ 2,879 $ 2,586
Revisions to cash flow and timing estimates 78,153 54,811
Debt Issuance Costs, Net 20,700 23,000
Unamortized debt discount 6,500 6,700
Asset retirement obligations 204,219 129,451
Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 2,879 2,586
Revisions to cash flow and timing estimates 78,153 54,811
Debt Issuance Costs, Net 16,700 17,300
Unamortized debt discount 6,156 6,272
Asset retirement obligations 204,219 129,451
Money Market Funds [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 25 21
Money Market Funds [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 25 21
Mutual Fund [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 2,854 2,565
Mutual Fund [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 2,854 2,565
Fair Value, Inputs, Level 1 [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 25 21
Fair Value, Inputs, Level 1 [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 25 21
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 25 21
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 25 21
Fair Value, Inputs, Level 1 [Member] | Mutual Fund [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 1 [Member] | Mutual Fund [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 2,854 2,565
Fair Value, Inputs, Level 2 [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 2,854 2,565
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member] | Mutual Fund [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 2,854 2,565
Fair Value, Inputs, Level 2 [Member] | Mutual Fund [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 2,854 2,565
Fair Value, Inputs, Level 3 [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | Mutual Fund [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | Mutual Fund [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Investments, Fair Value Disclosure $ 0 $ 0