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Organization and Basis of Presentation (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Income Taxes [Line Items]          
Increase to salaries and employee benefits   $ 43 $ 56 $ 79 $ 128
Number of reportable segments | segment       1  
Interest payment received from the IRS $ 37        
Out of Period Adjustment [Member]          
Income Taxes [Line Items]          
Current tax asset, out of period adjustment   36   $ 36  
Increase to salaries and employee benefits   $ 22   $ 22