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Short And Long-Term Debt Other Debt Facilities (Details) - USD ($) $ in Millions	Mar. 31, 2016	Oct. 23, 2015
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	$ 125	$ 125
Outstanding letters of credit	133
Unsecured Letter of Credit Facility
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	88
Outstanding letters of credit	80
Unsecured Letter of Credit Facility \| June 2017
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	81
Unsecured Letter of Credit Facility \| September 2018
Line of Credit Facility [Line Items]
Letter of Credit, borrowing capacity	$ 7