Balance Sheet Components Schedule of Other Asssets and Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other current assets:
Prepaid Expense, Current	$ 66	$ 57
Margin Deposit Assets	37	8
Assets from price risk management activities	102	33
Other Assets, Current	205	98
Accrued expenses and other current liabilities:
Regulatory Liability, Current	106	23
Accrued employee compensation and benefits	67	67
Accrued interest payable	29	29
Dividends payable	40	38
Taxes Payable, Current	46	36
Derivative, Collateral, Obligation to Return Cash	58	0
Other	111	129
Other Liabilities, Current	$ 457	$ 322