Balance Sheet Components Other Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Accrued employee compensation and benefits	$ 58	$ 66
Accrued taxes payable	29	34
Accrued interest payable	25	27
Accrued dividends payable	35	34
Regulatory liabilities—current	37	36
Other	63	71
Total accrued expenses and other current liabilities	$ 247	$ 268