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Receivables (Receivables Sold Under The Agreement) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Receivables [Line Items]    
Fair value of deferred proceeds $ 244 $ 214
IPL [Member]    
Receivables [Line Items]    
Fair value of deferred proceeds 244 214
Receivables Sold [Member] | IPL [Member]    
Receivables [Line Items]    
Customer accounts receivable 150 125
Unbilled utility revenues 119 104
Receivables sold to third party 269 229
Less: cash proceeds 15 1
Deferred proceeds 254 228
Less: allowance for expected credit losses 10 14
Fair value of deferred proceeds $ 244 $ 214