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Derivatives, Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivatives (Textual) [Abstract]          
Gains (losses) on derivatives used to hedge residential mortgage servicing rights $ 1,155 $ (319) $ 2,117 $ (1,539)  
Net Derivative Gains (Losses) From Economic Hedges Related To Mortgage Loans Held for Sale and Derivative Loan Commitments (283) 134 (434) 759  
Not designated as hedging instrument [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (990) 595 (3,628) 545  
Not designated as hedging instrument [Member] | Mortgage banking [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 1,051 (231) 1,980 (1,085)  
Not designated as hedging instrument [Member] | Net gain (loss) from equity securities [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (658) (540) (1,543) (598)  
Not designated as hedging instrument [Member] | Net gain (loss) from trading activities [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (1,404) 959 (3,816) 2,162  
Not designated as hedging instrument [Member] | Other [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 21 407 (249) 66  
Not designated as hedging instrument [Member] | Economic hedges [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 368 (247) 297 (1,046)  
Derivatives (Textual) [Abstract]          
Derivative Instruments Not Designated as Hedging Instruments, Loss (18)   (36)    
Derivative Instruments Not Designated as Hedging Instruments, Gain   8   36  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Interest contracts [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 874 (188) 1,690 (774)  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Equity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (665) (535) (1,543) (593)  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Foreign exchange contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 164 486 140 327  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Credit contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (5) (10) 10 (6)  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Mortgage banking [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 872 (185) 1,683 (780)  
Derivatives (Textual) [Abstract]          
Fair Value of Net Asset (Liability) From Economic Hedges Related To Mortgage Servicing Activities 602   602   $ 757
Not designated as hedging instrument [Member] | Economic hedges [Member] | Mortgage banking [Member] | Interest contracts [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 872 (185) 1,683 (780)  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Mortgage banking [Member] | Equity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Mortgage banking [Member] | Foreign exchange contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Mortgage banking [Member] | Credit contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Net gain (loss) from equity securities [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (658) (540) (1,543) (598)  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Net gain (loss) from equity securities [Member] | Interest contracts [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Net gain (loss) from equity securities [Member] | Equity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (658) (540) (1,543) (598)  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Net gain (loss) from equity securities [Member] | Foreign exchange contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Net gain (loss) from equity securities [Member] | Credit contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Net gain (loss) from trading activities [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Net gain (loss) from trading activities [Member] | Interest contracts [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Net gain (loss) from trading activities [Member] | Equity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Net gain (loss) from trading activities [Member] | Foreign exchange contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Net gain (loss) from trading activities [Member] | Credit contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Other [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 154 478 157 332  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Other [Member] | Interest contracts [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 2 (3) 7 6  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Other [Member] | Equity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (7) 5 0 5  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Other [Member] | Foreign exchange contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 164 486 140 327  
Not designated as hedging instrument [Member] | Economic hedges [Member] | Other [Member] | Credit contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (5) (10) 10 (6)  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (1,358) 842 (3,925) 1,591  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Interest contracts [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (43) 136 (209) 262  
Derivatives (Textual) [Abstract]          
Aggregate fair value of derivative loan commitments net asset (liability) 94   94   $ 60
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Commodity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 27 35 78 74  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Equity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (1,243) 584 (3,665) 848  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Foreign exchange contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (83) 91 (69) 401  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Credit contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (16) (4) (60) 6  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 179 (46) 297 (305)  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member] | Interest contracts [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 179 (46) 297 (305)  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member] | Commodity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member] | Equity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member] | Foreign exchange contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Mortgage banking [Member] | Credit contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity securities [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity securities [Member] | Interest contracts [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity securities [Member] | Commodity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity securities [Member] | Equity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity securities [Member] | Foreign exchange contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from equity securities [Member] | Credit contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (1,404) 959 (3,816) 2,162  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member] | Interest contracts [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (222) 182 (506) 567  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member] | Commodity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 27 35 78 74  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member] | Equity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (1,110) 655 (3,259) 1,114  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member] | Foreign exchange contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (83) 91 (69) 401  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Net gain (loss) from trading activities [Member] | Credit contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (16) (4) (60) 6  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (133) (71) (406) (266)  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member] | Interest contracts [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member] | Commodity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member] | Equity contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments (133) (71) (406) (266)  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member] | Foreign exchange contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments 0 0 0 0  
Not designated as hedging instrument [Member] | Customer accommodation trading, and other derivatives [Member] | Other [Member] | Credit contract [Member]          
Net Gains Losses Recognized In Income Statement Related To Derivatives Not Designated As Hedging Instruments [Abstract]          
Net gains (losses) recognized related to derivatives not designated as hedging instruments $ 0 $ 0 $ 0 $ 0