Balance Sheet Components Pension and Other Postretirement Benefits (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 5
Interest cost	7	7
Expected return on plan assets	(12)	(11)
Amortization of net actuarial loss	4	5
Net periodic benefit cost	$ 3	$ 6