Balance Sheet Components Pension and Other Postretirement Benefits (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 4
Interest cost	9	7
Expected return on plan assets	(11)	(12)
Amortization of net actuarial loss	0	4
Net periodic benefit cost	$ 1	$ 3