Balance Sheet Components Pension and Other Postretirement Benefits (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 5	$ 8	$ 10
Interest cost	7	7	14	14
Expected return on plan assets	(12)	(11)	(24)	(22)
Amortization of net actuarial loss	4	5	8	10
Net periodic benefit cost	$ 3	$ 6	$ 6	$ 12