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Summary Of Significant Accounting Policies Required Accounting Changes (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Unamortized Debt Issuance Expense $ 47 $ 41 $ 44 $ 40 $ 33