EBP Net Periodic Benefit Cost & OCI (Details 2) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits [Member]
Components of net periodic benefit cost (credit):
Service cost		$ 28	$ 30	$ 31
Interest cost		31	28	36
Expected return on plan assets		(44)	(43)	(53)
Amortization of net actuarial loss		12	14	21
Net actuarial loss from settlements		3	1	9
Reclassification to regulatory liability		0	0	0
Net periodic benefit cost (credit) (1)	[1]	30	30	44
Items Recognized in Other Comprehensive Income (Loss)
Net actuarial gain (loss) arising during the year		(14)	40	112
Amortization of net actuarial loss		12	14	21
Net actuarial loss from settlements		3	1	9
Total recognized in Other comprehensive income (loss)		1	55	142
Other Postretirement Benefits [Member]
Components of net periodic benefit cost (credit):
Service cost		1	1	1
Interest cost		6	5	7
Expected return on plan assets		(10)	(10)	(11)
Amortization of net actuarial loss		0	0	0
Net actuarial loss from settlements		0	0	0
Reclassification to regulatory liability		1	2	2
Net periodic benefit cost (credit) (1)	[1]	(2)	(2)	(1)
Items Recognized in Other Comprehensive Income (Loss)
Net actuarial gain (loss) arising during the year		14	29	(4)
Amortization of net actuarial loss		0	0	0
Net actuarial loss from settlements		0	0	0
Total recognized in Other comprehensive income (loss)		$ 14	$ 29	$ (4)

[1] Components other than Service cost are included in Other income (expense) – net below Operating income (loss) in the Consolidated Statement of Income.