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Receivables (Receivables Sold Under The Agreement) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Receivables [Line Items]    
Fair value of deferred proceeds $ 107 $ 188
IPL [Member]    
Receivables [Line Items]    
Fair value of deferred proceeds 107 188
Receivables Sold [Member] | IPL [Member]    
Receivables [Line Items]    
Customer accounts receivable 124 114
Unbilled utility revenues 74 92
Receivables sold to third party 198 206
Less: cash proceeds 75 1
Deferred proceeds 123 205
Less: allowance for expected credit losses 16 17
Fair value of deferred proceeds $ 107 $ 188