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Commitments (Commitments, Contingent Liabilities and Guarantees - Additional Information) (Detail) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2018
Sep. 30, 2014
Sep. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Loss Contingencies                      
Letters of Credit $ 2,190   $ 2,137                
Margin account balance held by the brokerage clearing agent 9   12                
Residential Mortgage                      
Loss Contingencies                      
Fair value of mortgage representation and warranty provisions 10                    
Repurchased Outstanding Principal 6 $ 9                  
Repurchase demand request 10 $ 18                  
Outstanding repurchase demand inventory 4   6                
Secured Debt                      
Loss Contingencies                      
Fully and unconditionally guaranteed certain long-term borrowing obligations issued by wholly-owned issuing trust entities 62   62                
Standby Letters of Credit                      
Loss Contingencies                      
Reserve for unfunded commitments $ 38   $ 20                
Standby letters of credit as a percentage of total letters of credit 99.00%   99.00%                
Standby Letters of Credit | Secured Debt                      
Loss Contingencies                      
Standby letters of credit as a percentage of total letters of credit 62.00%   66.00%                
Variable Rate Demand Note                      
Loss Contingencies                      
Fifth Third Securities, Inc. (FTS) acted as the remarketing agent to issuers of VRDNs $ 429   $ 445                
Letters of Credit 3   3                
Total Variable Rate Demand Notes 432   449                
Letters Credit Issued Related Variable Rate Demand Notes 178   187                
Variable Rate Demand Note | Trading Securities                      
Loss Contingencies                      
Total Variable Rate Demand Notes 0   3                
Other Liabilities                      
Loss Contingencies                      
Reserve for unfunded commitments 169   144                
Other Liabilities | Residential Mortgage                      
Loss Contingencies                      
Outstanding balances on residential mortgage loans sold with representation and warranty provisions 6   6                
Visa                      
Loss Contingencies                      
Fair value of mortgage representation and warranty provisions $ 171   $ 163                
Visa IPO, shares of Visa's Class B common stock received 10.1                    
Visa Class B shares carryover basis $ 0                    
Escrow Deposit $ 3,000     $ 300 $ 600 $ 450 $ 150 $ 1,565 $ 400 $ 800 $ 500