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Other Assets (Details Textuals) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Assets [Line Items]      
Prepaid expenses $ 696.0 $ 851.0  
Restricted cash $ 286.0 $ 477.0  
Amortization period of acquired finite-lived intangible assets 7 years 5 years  
Other intangible assets, at amortized cost $ 868.0 $ 796.0  
Foreign deferred tax liabilities 81.0 80.0  
Tax Credit Investments - Affordable Housing partnerships 798.0 578.0  
Other Assets (Textuals) [Abstract]      
Goodwill impaired 1.0 219.0  
Accumulated goodwill impairment losses 220.0 219.0  
Amortization expense 194.0 183.0 $ 174.0
Sale of Concur Technologies 10.0 0.0 990.0
Gain on sale of investments in Concur Technologies 0.0 0.0 $ 744.0
Community Reinvestment Act Tax Credit Investments 824.0 638.0  
Other Expense [Member]      
Other Assets [Line Items]      
Loss from Affordable Housing Projects Equity Method Investments 43.0 50.0  
Income Tax Provision [Member]      
Other Assets [Line Items]      
QAH Tax Credits for equity method losses 63.0 53.0  
Other Liabilities [Member]      
Other Assets [Line Items]      
QAH Investment Commitment 266.0    
Variable Interest Enterprise [Member]      
Other Assets [Line Items]      
Restricted cash 38.0 155.0  
Affordable Housing Program Off Balance Sheet Obligation 151.0    
Tax Credit Investments - Affordable Housing partnerships 701.0 489.0  
Variable Interest Enterprise [Member] | Other Liabilities [Member]      
Other Assets [Line Items]      
QAH Investment Commitment $ 239.0    
Earliest Year [Member]      
Other Assets [Line Items]      
Affordable Housing Tax Credits Commitment Year To Be Paid 2017    
Latest Year [Member]      
Other Assets [Line Items]      
Affordable Housing Tax Credits Commitment Year To Be Paid 2029    
Customer Relationships [Member]      
Other Assets [Line Items]      
Other intangible assets, at amortized cost $ 730.0 670.0  
Other Contracts [Member]      
Other Assets [Line Items]      
Other intangible assets, at amortized cost $ 138.0 $ 126.0  
Minimum [Member]      
Other Assets [Line Items]      
Intangible Assets, Useful Life 1 year 5 years  
Maximum [Member]      
Other Assets [Line Items]      
Intangible Assets, Useful Life 22 years 7 years