Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2022

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic benefit cost (credit) is as follows:

	Pension Benefits
	Three Months Ended  March 31,
	2022		2021
	(Millions)
Components of net periodic benefit cost (credit):
Service cost	$	7	$	8
Interest cost	7		7
Expected return on plan assets	(11)		(11)
Amortization of net actuarial loss	3		4
Net periodic benefit cost (credit)	$	6	$	8

	Other Postretirement Benefits
	Three Months Ended  March 31,
	2022		2021
	(Millions)
Components of net periodic benefit cost (credit):
Interest cost	$	1	$	1
Expected return on plan assets	(2)		(2)
Reclassification to regulatory liability	—		1
Net periodic benefit cost (credit)	$	(1)	$	—