Employee Benefit Plans (Quarterly Info) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits [Member]
Components of net periodic benefit cost (credit):
Service cost	$ 7	$ 8	$ 21	$ 23
Interest cost	8	7	23	21
Expected return on plan assets	(11)	(11)	(33)	(33)
Amortization of net actuarial loss	3	4	9	11
Net actuarial loss from settlements	0	0	0	1
Net periodic benefit cost (credit)	7	8	20	23
Other Postretirement Benefits [Member]
Components of net periodic benefit cost (credit):
Service cost	1	1	1	1
Interest cost	1	1	4	4
Expected return on plan assets	(3)	(2)	(8)	(7)
Reclassification to regulatory liability	0	0	1	1
Net periodic benefit cost (credit)	$ (1)	$ 0	$ (2)	$ (1)