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Balance Sheet Components Pension and Other Postretirement Benefits (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5	$ 4	$ 15	$ 12
Interest cost	6	8	20	24
Expected return on plan assets	(12)	(11)	(34)	(33)
Amortization of net actuarial loss	6	4	16	12
Net periodic benefit cost	$ 5	$ 5	$ 17	$ 15

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