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Balance Sheet Components Other Current Assets (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Other Current Assets [Line Items] |  |
Prepaid expenses | $ 44 | $ 57
Assets from price risk management activities | 194 | 33
Margin deposits | 5 | 8
Other current assets | $ 243 | $ 98

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- Definition Regulatory assets from price risk management activities + References No definition available. + Details
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