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Employee Benefit Plans - Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Other liabilities $ 784 $ 972
Other Postretirement Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Other liabilities $ 142 $ 134