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Contingencies and Litigation - Other Contingencies (Details)
loans in Millions, $ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
loans
Surety Bond [Member]  
Guarantor Obligations [Line Items]  
Maximum exposure, undiscounted $ 655
Letter of Credit [Member]  
Guarantor Obligations [Line Items]  
Maximum exposure, undiscounted $ 102
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]  
Guarantor Obligations [Line Items]  
Outstanding Student Loan Portfolio, Loans | loans 1.6
Outstanding Principal Balance - Student Loan Portfolio $ 24,100
Reserves for losses on defaulted loans $ 4
State Of Texas v. Xerox Corporation, Xerox State Healthcare, LLC, and ACS State Healthcare, LLC  
Guarantor Obligations [Line Items]  
Damages sought, multiplier of overpayment amount 2