Balance Sheet Components Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Accrued employee compensation and benefits	$ 42	$ 66
Accrued taxes payable	37	34
Accrued interest payable	44	27
Accrued dividends payable	33	34
Regulatory liabilities—current	41	36
Other	66	71
Total accrued expenses and other current liabilities	$ 263	$ 268