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Employee Benefits Assets and Liabilities associated with Non-qualified benefit plans (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Non-qualified benefit plan trust $ 37 $ 34
Non-qualified benefit plan liabilities 106 105
Other Postretirement Benefit Plans [Domain]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Non-qualified benefit plan trust 0 0
Defined Benefit Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Non-qualified benefit plan trust 20 18
Non-qualified benefit plan liabilities 81 80
Non Qualified Benefit Plans [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Non-qualified benefit plan trust 17 16
Non-qualified benefit plan liabilities $ 25 $ 25