Balance Sheet Components Pension and Other Postretirement Benefits (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 5	$ 12	$ 15
Interest cost	7	6	21	20
Expected return on plan assets	(12)	(12)	(36)	(34)
Amortization of net actuarial loss	4	6	12	16
Net periodic benefit cost	$ 3	$ 5	$ 9	$ 17