Derivative Instruments (Fair Value Of Financial Instruments) (Details) - Commodity Contracts [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Current derivative assets	$ 111	$ 113
Non-current derivative assets	126	63
Current derivative liabilities	59	8
Non-current derivative liabilities	20	1
IPL [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	69	48
Non-current derivative assets	69	36
Current derivative liabilities	40	4
Non-current derivative liabilities	6	0
WPL [Member]
Derivatives, Fair Value [Line Items]
Current derivative assets	42	65
Non-current derivative assets	57	27
Current derivative liabilities	19	4
Non-current derivative liabilities	$ 14	$ 1