Benefit Plans, Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost			$ 1	$ 1
Interest cost	18	18	37	36
Expected return on plan assets	(40)	(43)	(83)	(86)
Amortization of unrecognized net loss	8	13	16	25
Settlements	1	2	2	2
Regulatory asset decrease	1		2
Net periodic benefit	(12)	(10)	(25)	(22)
Other Postretirement Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	1	1	1	1
Expected return on plan assets	(1)		(1)	(1)
Net periodic benefit	$ 0	$ 1	$ 0	$ 0