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Balance Sheet Components Pension and Other Postretirement Benefits (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 4
Interest cost	8	8
Expected return on plan assets	(11)	(10)
Amortization of net actuarial loss	4	3
Net periodic benefit cost	$ 5	$ 5

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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