EBP Net Periodic Benefit Cost & OCI (Details 2) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits [Member]
Components of net periodic benefit cost (credit):
Service cost		$ 23	$ 28	$ 30
Interest cost		46	31	28
Expected return on plan assets		(57)	(44)	(43)
Amortization of net actuarial loss (gain)		5	12	14
Net actuarial loss from settlements		0	3	1
Reclassification to regulatory liability		0	0	0
Net periodic benefit cost (credit) (1)	[1]	17	30	30
Items Recognized in Other Comprehensive Income (Loss)
Net actuarial gain (loss) arising during the year		(5)	(14)	40
Amortization of net actuarial loss (gain)		5	12	14
Net actuarial loss from settlements		0	3	1
Total recognized in Other comprehensive income (loss)		0	1	55
Other Postretirement Benefits [Member]
Components of net periodic benefit cost (credit):
Service cost		1	1	1
Interest cost		7	6	5
Expected return on plan assets		(10)	(10)	(10)
Amortization of net actuarial loss (gain)		(3)	0	0
Net actuarial loss from settlements		0	0	0
Reclassification to regulatory liability		0	1	2
Net periodic benefit cost (credit) (1)	[1]	(5)	(2)	(2)
Items Recognized in Other Comprehensive Income (Loss)
Net actuarial gain (loss) arising during the year		3	14	29
Amortization of net actuarial loss (gain)		(2)	0	0
Net actuarial loss from settlements		0	0	0
Total recognized in Other comprehensive income (loss)		$ 1	$ 14	$ 29

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