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Commitments, Contingent Liabilities and Guarantees - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Dec. 31, 2012
Sep. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
Loss Contingencies [Line Items]                      
Letters of Credit $ 3,055 $ 3,974                  
Total Variable Rate Demand Notes 1,300 1,700                  
Margin account balance held by the brokerage clearing agent 10 13                  
Repurchase Claim Settlement     $ 25                
Amount in excess of amounts reserved 37                    
Credit loss reserve 1,272 [1] 1,322 [1] 1,582   $ 1,854            
Residential Mortgage                      
Loss Contingencies [Line Items]                      
Amount in excess of amounts reserved 27                    
Outstanding balances on residential mortgage loans sold with representation and warranty provisions 25 35 $ 44                
Outstanding balances on residential mortgage loans sold with credit recourse $ 465 $ 548                  
Delinquency Rates 3.00% 4.00%                  
Credit loss reserve $ 9 $ 11                  
Make Whole Payments 2 11                  
Repurchased Outstanding Principal 74 59                  
Repurchase Demand Request 75 97                  
Outstanding Repurchase Demand Inventory 4 7                  
Secured Debt                      
Loss Contingencies [Line Items]                      
Fully and unconditionally guaranteed certain long-term borrowing obligations issued by wholly-owned issuing trust entities $ 62 62                  
Standby Letters of Credit                      
Loss Contingencies [Line Items]                      
Reserve for unfunded commitments   $ 1                  
Standby letters of credit as a percentage of total letters of credit 99.00% 97.00%                  
Standby Letters of Credit | Secured Debt                      
Loss Contingencies [Line Items]                      
Standby letters of credit as a percentage of total letters of credit 65.00% 60.00%                  
Variable Rate Demand Note                      
Loss Contingencies [Line Items]                      
Fifth Third Securities, Inc. (FTS) acted as the remarketing agent to issuers of VRDNs $ 1,100 $ 1,400                  
Letters of Credit 187 247                  
Letters Credit Issued Related Variable Rate Demand Notes 921 1,200                  
Other Liabilities                      
Loss Contingencies [Line Items]                      
Reserve for unfunded commitments 138 135                  
Other Liabilities | Residential Mortgage                      
Loss Contingencies [Line Items]                      
Outstanding balances on residential mortgage loans sold with representation and warranty provisions 25 35                  
Private Mortgage Reinsurance                      
Loss Contingencies [Line Items]                      
Total outstanding reinsurance coverage 27 29                  
Approximate reserve related to exposures within the reinsurance portfolio $ 2 2                  
Private Mortgage Reinsurance | Lower limit                      
Loss Contingencies [Line Items]                      
Reinsurance coverage ranges of the total PMI coverage 5.00%                    
Private Mortgage Reinsurance | Upper Limit                      
Loss Contingencies [Line Items]                      
Reinsurance coverage ranges of the total PMI coverage 10.00%                    
Visa Litigation                      
Loss Contingencies [Line Items]                      
Recorded share of litigation formally settled by Visa and for probable future litigation settlements $ 61 $ 49                  
Visa deposited into the litigation escrow account                     $ 3
Visa                      
Loss Contingencies [Line Items]                      
Visa IPO, shares of Visa's Class B common stock received                     10.1
Visa deposited into the litigation escrow account       $ 450   $ 150 $ 1,565 $ 400 $ 800 $ 500  
[1] Includes $152 and $179 of cash and due from banks, $2,537 and $3,378 of portfolio loans and leases, $(28) and $(22) of ALLL, $20 and $25 of other assets, $3 and $5 of other liabilities and $2,493 and $3,434 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2015 and 2014, respectively. For further information, refer to Note 11.