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Details of Income Statement Items (Other Income and Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other income and expenses [Abstract]      
Capital gain $ 841 $ 54 $ 0
Past service cost 7 0 14
Energy Transmission Charges 0 6 16
Insurance compensation 0 30 30
Other 11 19 11
Other income recorded in the income statements 859 109 71
Provision for legal claims 31 31 21
Impairment of assets 19 32 489
Provision for historical waste removal and closure costs 18 0 51
Provision for early retirement and dismissal of employees 7 20 39
Environment related provision 1 7 0
Other 8 0 18
Other expenses recorded in the income statements $ 84 $ 90 $ 618