Benefit Plans (Defined Benefit Pension And Other Postretirement Benefits Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Pension settlement losses	$ (6)	$ (5)	$ (14)
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	11	11
Interest cost	36	34	43
Expected return on plan assets	(69)	(69)	(70)
Amortization of prior service cost (credit)	(1)	0	0
Amortization of actuarial loss	32	39	34
Settlement losses	26	0	12
Total	33	15	30
Pension settlement losses	7
Other Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4	3
Interest cost	6	5	7
Expected return on plan assets	(5)	(5)	(5)
Amortization of prior service cost (credit)	0	0	0
Amortization of actuarial loss	2	5	3
Settlement losses	0	0	0
Total	6	9	8
IPL [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement losses	(6)	(1)	(8)
IPL [Member] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7	7
Interest cost	16	16	20
Expected return on plan assets	(31)	(32)	(33)
Amortization of actuarial loss	13	17	15
Settlement losses	13	0	7
Total	17	8	16
Pension settlement losses	7
IPL [Member] | Other Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1
Interest cost	2	2	3
Expected return on plan assets	(4)	(3)	(4)
Amortization of actuarial loss	1	2	1
Settlement losses	0	0	0
Total	0	2	1
WPL [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement losses	1	(2)	(3)
WPL [Member] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4	4
Interest cost	16	15	19
Expected return on plan assets	(31)	(31)	(31)
Amortization of prior service cost (credit)	0	0	0
Amortization of actuarial loss	15	19	16
Settlement losses	13	0	0
Total	16	7	8
WPL [Member] | Other Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2
Interest cost	2	2	3
Expected return on plan assets	(1)	0	(1)
Amortization of prior service cost (credit)	0	0	(1)
Amortization of actuarial loss	2	2	2
Settlement losses	0	0	0
Total	$ 4	$ 5	$ 5