Receivables (Receivables Sold Under The Agreement) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Receivables [Line Items]
Fair value of deferred proceeds	$ 153	$ 185
IPL [Member]
Receivables [Line Items]
Fair value of deferred proceeds	153	185
Receivables Sold [Member] | IPL [Member]
Receivables [Line Items]
Customer accounts receivable	161	145
Unbilled utility revenues	94	132
Receivables sold to third party	255	277
Less: cash proceeds	89	80
Deferred proceeds	166	197
Less: allowance for expected credit losses	13	12
Fair value of deferred proceeds	$ 153	$ 185