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Short And Long-Term Debt Other Debt Facilities (Details) $ in Millions	Jun. 30, 2017 USD ($)
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	$ 125
Unsecured Letter of Credit Facility
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	131
Outstanding letters of credit	124
Unsecured Letter of Credit Facility \| September 2018
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	65
Unsecured Letter of Credit Facility \| December 2019
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	$ 66