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Receivables (Receivables Sold Under The Agreement) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Receivables [Line Items]    
Fair value of deferred proceeds $ 184 $ 216
IPL [Member]    
Receivables [Line Items]    
Fair value of deferred proceeds 184 216
Receivables Sold [Member] | IPL [Member]    
Receivables [Line Items]    
Customer accounts receivable 125 130
Unbilled utility revenues 89 98
Other receivables 1 1
Receivables sold to third party 215 229
Less: cash proceeds 18 1
Deferred proceeds 197 228
Less: allowance for expected credit losses 13 12
Fair value of deferred proceeds $ 184 $ 216