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Balance Sheet Components (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Regulatory Liability, Noncurrent $ 1,355 $ 1,288    
Allowance for Doubtful Accounts Receivable, Current $ 15 $ 6 $ 6 $ 6