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Balance Sheet Components Pension and Other Postretirement Benefits (Details) - Pension Plan [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 3 | $ 3 | $ 5 | $ 6
Interest cost | 8 | 9 | 17 | 18
Expected return on plan assets | (10) | (11) | (20) | (22)
Net periodic benefit cost | $ 1 | $ 1 | $ 2 | $ 2

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