Balance Sheet Components Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accrued employee compensation and benefits	$ 48	$ 67
Accrued taxes payable	45	36
Accrued interest payable	43	29
Accrued dividends payable	37	38
Regulatory liabilities—current	42	23
Other	104	129
Total accrued expenses and other current liabilities	$ 319	$ 322