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Receivables (Receivables Sold Under The Agreement) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Receivables [Line Items]    
Fair value of deferred proceeds $ 201 $ 188
IPL [Member]    
Receivables [Line Items]    
Fair value of deferred proceeds 201 188
Receivables Sold [Member] | IPL [Member]    
Receivables [Line Items]    
Customer accounts receivable 148 125
Unbilled utility revenues 67 95
Other receivables 0 1
Receivables sold to third party 215 221
Less: cash proceeds 1 27
Deferred proceeds 214 194
Less: allowance for expected credit losses 13 6
Fair value of deferred proceeds $ 201 $ 188