Balance Sheet Components Pension and Other Postretirement Benefits (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 4	$ 6	$ 8
Interest cost	9	7	18	14
Expected return on plan assets	(11)	(12)	(22)	(24)
Amortization of net actuarial loss	0	4	0	8
Net periodic benefit cost	$ 1	$ 3	$ 2	$ 6