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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Amortized Cost Basis by Credit Quality Indicator (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 123,090 $ 119,088
SBA Guaranteed PPP Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 4,200  
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 10,683  
2019 9,445  
2018 7,862  
2017 3,746  
2016 2,200  
Prior to 2016 3,998  
Within the Revolving Period 22,459  
Converted to Term 400  
Total 60,793 57,538
Commercial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 10,339  
2019 8,812  
2018 7,219  
2017 3,419  
2016 1,903  
Prior to 2016 3,572  
Within the Revolving Period 20,552  
Converted to Term 340  
Total 56,156  
Commercial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 56  
2019 398  
2018 286  
2017 180  
2016 156  
Prior to 2016 239  
Within the Revolving Period 1,071  
Converted to Term 34  
Total 2,420  
Commercial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 207  
2019 199  
2018 315  
2017 109  
2016 138  
Prior to 2016 153  
Within the Revolving Period 749  
Converted to Term 22  
Total 1,892  
Commercial | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 81  
2019 36  
2018 42  
2017 38  
2016 3  
Prior to 2016 34  
Within the Revolving Period 87  
Converted to Term 4  
Total 325  
Commercial | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 8,226  
2019 6,199  
2018 4,625  
2017 2,396  
2016 1,301  
Prior to 2016 2,311  
Within the Revolving Period 18,715  
Converted to Term 400  
Total 44,173 41,479
Commercial | Commercial and industrial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 8,036  
2019 5,730  
2018 4,180  
2017 2,174  
2016 1,157  
Prior to 2016 1,980  
Within the Revolving Period 17,281  
Converted to Term 340  
Total 40,878  
Commercial | Commercial and industrial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 34  
2019 264  
2018 163  
2017 84  
2016 60  
Prior to 2016 173  
Within the Revolving Period 771  
Converted to Term 34  
Total 1,583  
Commercial | Commercial and industrial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 91  
2019 195  
2018 248  
2017 100  
2016 81  
Prior to 2016 127  
Within the Revolving Period 600  
Converted to Term 22  
Total 1,464  
Commercial | Commercial and industrial | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 65  
2019 10  
2018 34  
2017 38  
2016 3  
Prior to 2016 31  
Within the Revolving Period 63  
Converted to Term 4  
Total 248  
Commercial | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,999  
2019 2,994  
2018 3,004  
2017 1,203  
2016 713  
Prior to 2016 995  
Within the Revolving Period 3,744  
Converted to Term 0  
Total 14,652 13,522
Commercial | Commercial real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,848  
2019 2,836  
2018 2,810  
2017 1,106  
2016 566  
Prior to 2016 919  
Within the Revolving Period 3,271  
Converted to Term 0  
Total 13,356  
Commercial | Commercial real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 19  
2019 130  
2018 121  
2017 92  
2016 94  
Prior to 2016 48  
Within the Revolving Period 300  
Converted to Term 0  
Total 804  
Commercial | Commercial real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 116  
2019 2  
2018 65  
2017 5  
2016 53  
Prior to 2016 26  
Within the Revolving Period 149  
Converted to Term 0  
Total 416  
Commercial | Commercial real estate | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 16  
2019 26  
2018 8  
2017 0  
2016 0  
Prior to 2016 2  
Within the Revolving Period 24  
Converted to Term 0  
Total 76  
Commercial | Leases    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 458  
2019 252  
2018 233  
2017 147  
2016 186  
Prior to 2016 692  
Within the Revolving Period 0  
Converted to Term 0  
Total 1,968 2,537
Commercial | Leases | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 455  
2019 246  
2018 229  
2017 139  
2016 180  
Prior to 2016 673  
Within the Revolving Period 0  
Converted to Term 0  
Total 1,922  
Commercial | Leases | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3  
2019 4  
2018 2  
2017 4  
2016 2  
Prior to 2016 18  
Within the Revolving Period 0  
Converted to Term 0  
Total 33  
Commercial | Leases | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 2  
2018 2  
2017 4  
2016 4  
Prior to 2016 0  
Within the Revolving Period 0  
Converted to Term 0  
Total 12  
Commercial | Leases | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior to 2016 1  
Within the Revolving Period 0  
Converted to Term 0  
Total 1  
Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 17,242  
2019 10,972  
2018 5,335  
2017 4,816  
2016 4,462  
Prior to 2016 6,323  
Within the Revolving Period 11,755  
Converted to Term 1,392  
Total 62,297 61,550
Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 6,512  
2019 3,493  
2018 1,278  
2017 1,947  
2016 2,770  
Prior to 2016 3,539  
Within the Revolving Period 0  
Converted to Term 0  
Total 19,539 19,083
Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 6  
2019 47  
2018 75  
2017 78  
2016 50  
Prior to 2016 833  
Within the Revolving Period 9,692  
Converted to Term 1,368  
Total 12,149 13,154
Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 4,728  
2019 3,449  
2018 1,864  
2017 1,232  
2016 642  
Prior to 2016 238  
Within the Revolving Period 0  
Converted to Term 0  
Total 12,153 12,120
Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 4,094  
2019 2,706  
2018 1,606  
2017 1,333  
2016 952  
Prior to 2016 1,617  
Within the Revolving Period 0  
Converted to Term 0  
Total 12,308 10,347
Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,902  
2019 1,277  
2018 512  
2017 226  
2016 48  
Prior to 2016 96  
Within the Revolving Period 2,063  
Converted to Term 24  
Total 6,148 $ 6,846
Greater than 800 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 6,023  
2019 4,448  
2018 2,084  
2017 2,306  
2016 2,382  
Prior to 2016 2,854  
Within the Revolving Period 4,660  
Converted to Term 344  
Total 25,101  
Greater than 800 | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,687  
2019 1,885  
2018 638  
2017 1,129  
2016 1,615  
Prior to 2016 1,755  
Within the Revolving Period 0  
Converted to Term 0  
Total 9,709  
Greater than 800 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2  
2019 8  
2018 10  
2017 7  
2016 5  
Prior to 2016 216  
Within the Revolving Period 4,319  
Converted to Term 344  
Total 4,911  
Greater than 800 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,056  
2019 812  
2018 424  
2017 312  
2016 169  
Prior to 2016 62  
Within the Revolving Period 0  
Converted to Term 0  
Total 2,835  
Greater than 800 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,817  
2019 1,363  
2018 849  
2017 781  
2016 578  
Prior to 2016 777  
Within the Revolving Period 0  
Converted to Term 0  
Total 6,165  
Greater than 800 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 461  
2019 380  
2018 163  
2017 77  
2016 15  
Prior to 2016 44  
Within the Revolving Period 341  
Converted to Term 0  
Total 1,481  
740-799 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 6,864  
2019 3,630  
2018 1,661  
2017 1,345  
2016 1,190  
Prior to 2016 1,597  
Within the Revolving Period 3,872  
Converted to Term 333  
Total 20,492  
740-799 | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,931  
2019 1,133  
2018 398  
2017 527  
2016 743  
Prior to 2016 904  
Within the Revolving Period 0  
Converted to Term 0  
Total 6,636  
740-799 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2  
2019 6  
2018 7  
2017 6  
2016 5  
Prior to 2016 180  
Within the Revolving Period 3,234  
Converted to Term 331  
Total 3,771  
740-799 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,514  
2019 1,022  
2018 531  
2017 344  
2016 172  
Prior to 2016 59  
Within the Revolving Period 0  
Converted to Term 0  
Total 3,642  
740-799 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,797  
2019 1,009  
2018 541  
2017 387  
2016 251  
Prior to 2016 423  
Within the Revolving Period 0  
Converted to Term 0  
Total 4,408  
740-799 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 620  
2019 460  
2018 184  
2017 81  
2016 19  
Prior to 2016 31  
Within the Revolving Period 638  
Converted to Term 2  
Total 2,035  
680-739 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,077  
2019 1,842  
2018 917  
2017 644  
2016 541  
Prior to 2016 918  
Within the Revolving Period 2,193  
Converted to Term 289  
Total 10,421  
680-739 | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 784  
2019 351  
2018 162  
2017 172  
2016 295  
Prior to 2016 458  
Within the Revolving Period 0  
Converted to Term 0  
Total 2,222  
680-739 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1  
2019 6  
2018 10  
2017 15  
2016 8  
Prior to 2016 179  
Within the Revolving Period 1,632  
Converted to Term 284  
Total 2,135  
680-739 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,347  
2019 889  
2018 461  
2017 282  
2016 138  
Prior to 2016 47  
Within the Revolving Period 0  
Converted to Term 0  
Total 3,164  
680-739 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 450  
2019 294  
2018 173  
2017 127  
2016 90  
Prior to 2016 221  
Within the Revolving Period 0  
Converted to Term 0  
Total 1,355  
680-739 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 495  
2019 302  
2018 111  
2017 48  
2016 10  
Prior to 2016 13  
Within the Revolving Period 561  
Converted to Term 5  
Total 1,545  
620-679 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,040  
2019 727  
2018 391  
2017 276  
2016 192  
Prior to 2016 491  
Within the Revolving Period 576  
Converted to Term 202  
Total 3,895  
620-679 | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 97  
2019 94  
2018 44  
2017 56  
2016 66  
Prior to 2016 223  
Within the Revolving Period 0  
Converted to Term 0  
Total 580  
620-679 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 10  
2018 18  
2017 21  
2016 14  
Prior to 2016 136  
Within the Revolving Period 402  
Converted to Term 195  
Total 796  
620-679 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 669  
2019 484  
2018 259  
2017 157  
2016 84  
Prior to 2016 32  
Within the Revolving Period 0  
Converted to Term 0  
Total 1,685  
620-679 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 26  
2019 35  
2018 33  
2017 28  
2016 25  
Prior to 2016 95  
Within the Revolving Period 0  
Converted to Term 0  
Total 242  
620-679 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 248  
2019 104  
2018 37  
2017 14  
2016 3  
Prior to 2016 5  
Within the Revolving Period 174  
Converted to Term 7  
Total 592  
Less than 620 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 179  
2019 322  
2018 281  
2017 240  
2016 156  
Prior to 2016 385  
Within the Revolving Period 182  
Converted to Term 222  
Total 1,967  
Less than 620 | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 12  
2019 28  
2018 35  
2017 58  
2016 50  
Prior to 2016 185  
Within the Revolving Period 0  
Converted to Term 0  
Total 368  
Less than 620 | Retail | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1  
2019 17  
2018 30  
2017 29  
2016 18  
Prior to 2016 122  
Within the Revolving Period 105  
Converted to Term 214  
Total 536  
Less than 620 | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 140  
2019 242  
2018 189  
2017 137  
2016 79  
Prior to 2016 34  
Within the Revolving Period 0  
Converted to Term 0  
Total 821  
Less than 620 | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2  
2019 5  
2018 10  
2017 10  
2016 8  
Prior to 2016 41  
Within the Revolving Period 0  
Converted to Term 0  
Total 76  
Less than 620 | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 24  
2019 30  
2018 17  
2017 6  
2016 1  
Prior to 2016 3  
Within the Revolving Period 77  
Converted to Term 8  
Total 166  
No FICO available | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 59  
2019 3  
2018 1  
2017 5  
2016 1  
Prior to 2016 78  
Within the Revolving Period 272  
Converted to Term 2  
Total 421  
No FICO available | Retail | Residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1  
2019 2  
2018 1  
2017 5  
2016 1  
Prior to 2016 14  
Within the Revolving Period 0  
Converted to Term 0  
Total 24  
No FICO available | Retail | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2  
2019 0  
2018 0  
2017 0  
2016 0  
Prior to 2016 4  
Within the Revolving Period 0  
Converted to Term 0  
Total 6  
No FICO available | Retail | Education    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2  
2019 0  
2018 0  
2017 0  
2016 0  
Prior to 2016 60  
Within the Revolving Period 0  
Converted to Term 0  
Total 62  
No FICO available | Retail | Other retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 54  
2019 1  
2018 0  
2017 0  
2016 0  
Prior to 2016 0  
Within the Revolving Period 272  
Converted to Term 2  
Total $ 329