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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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Regulatory assets from price risk management activities

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The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer.

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