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Loans and Allowance for Credit Losses, Troubled Debt Restructurings Modifications by Type (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
Financing Receivable, Modifications [Line Items]          
Net loans $ 940,186   $ 940,186   $ 943,335
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 729 $ 1,121 1,868 $ 2,300  
Financial effects of modifications          
Charge-offs $ 35 $ 23 $ 56 $ 40  
Weighted average interest rate reduction 7.17% 8.30% 8.18% 7.92%  
Total Commercial [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 359 $ 590 $ 1,002 $ 1,233  
Financial effects of modifications          
Charge-offs $ 26 $ 14 $ 39 $ 20  
Weighted average interest rate reduction 0.40% 0.64% 0.47% 0.88%  
Commercial and industrial loans [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 214 $ 457 $ 779 $ 954  
Financial effects of modifications          
Charge-offs $ 26 $ 14 $ 39 $ 20  
Weighted average interest rate reduction 0.34% 0.58% 0.42% 0.88%  
Commercial real estate mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 119 $ 132 $ 194 $ 236  
Financial effects of modifications          
Charge-offs $ 0 $ 0 $ 0 $ 0  
Weighted average interest rate reduction 0.49% 0.67% 0.54% 0.89%  
Commercial real estate construction [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 26 $ 1 $ 29 $ 4  
Financial effects of modifications          
Charge-offs $ 0 $ 0 $ 0 $ 0  
Weighted average interest rate reduction 0.00% 0.00% 0.00% 0.00%  
Commercial lease financing receivable [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0 $ 0 $ 0 $ 39  
Financial effects of modifications          
Charge-offs $ 0 $ 0 $ 0 $ 0  
Weighted average interest rate reduction 0.00% 0.00% 0.00% 0.00%  
Total Consumer [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 370 $ 531 $ 866 $ 1,067  
Financial effects of modifications          
Charge-offs $ 9 $ 9 $ 17 $ 20  
Weighted average interest rate reduction 10.06% 9.17% 10.17% 8.67%  
Real estate 1-4 family first mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 211 $ 358 $ 543 $ 720  
Financial effects of modifications          
Charge-offs $ 0 $ 2 $ 1 $ 3  
Weighted average interest rate reduction 1.83% 2.26% 1.89% 2.33%  
Real estate 1-4 family junior lien mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 33 $ 44 $ 71 $ 81  
Financial effects of modifications          
Charge-offs $ 1 $ 2 $ 2 $ 3  
Weighted average interest rate reduction 2.39% 1.66% 2.34% 1.89%  
Credit Card [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 89 $ 83 $ 186 $ 169  
Financial effects of modifications          
Charge-offs $ 0 $ 0 $ 0 $ 0  
Weighted average interest rate reduction 13.35% 13.19% 13.27% 12.24%  
Automobile [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 19 $ 17 $ 34 $ 36  
Financial effects of modifications          
Charge-offs $ 8 $ 5 $ 14 $ 14  
Weighted average interest rate reduction 4.13% 6.49% 4.55% 6.48%  
Other revolving credit and installment [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 13 $ 12 $ 27 $ 29  
Financial effects of modifications          
Charge-offs $ 0 $ 0 $ 0 $ 0  
Weighted average interest rate reduction 7.67% 7.95% 7.63% 7.95%  
Trial modifications [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 5 $ 17 $ 5 $ 32  
Financial effects of modifications          
Charge-offs $ 0 $ 0 $ 0 $ 0  
Weighted average interest rate reduction 0.00% 0.00% 0.00% 0.00%  
Modification to principal [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 44 $ 71 $ 83 $ 119  
Modification to principal [Member] | Total Commercial [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 13 3 13 3  
Modification to principal [Member] | Commercial and industrial loans [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 3 0 3  
Modification to principal [Member] | Commercial real estate mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Modification to principal [Member] | Commercial real estate construction [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 13 0 13 0  
Modification to principal [Member] | Commercial lease financing receivable [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Modification to principal [Member] | Total Consumer [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 31 68 70 116  
Modification to principal [Member] | Real estate 1-4 family first mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 28 64 63 110  
Modification to principal [Member] | Real estate 1-4 family junior lien mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 1 2 3 3  
Modification to principal [Member] | Credit Card [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Modification to principal [Member] | Automobile [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 2 2 4 3  
Modification to principal [Member] | Other revolving credit and installment [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Modification to principal [Member] | Trial modifications [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Contractual Interest Rate Reduction [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 175 133 311 271  
Contractual Interest Rate Reduction [Member] | Total Commercial [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 58 16 71 31  
Contractual Interest Rate Reduction [Member] | Commercial and industrial loans [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 34 5 45 14  
Contractual Interest Rate Reduction [Member] | Commercial real estate mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 24 11 26 17  
Contractual Interest Rate Reduction [Member] | Commercial real estate construction [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Contractual Interest Rate Reduction [Member] | Commercial lease financing receivable [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Contractual Interest Rate Reduction [Member] | Total Consumer [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 117 117 240 240  
Contractual Interest Rate Reduction [Member] | Real estate 1-4 family first mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 2 8 5 18  
Contractual Interest Rate Reduction [Member] | Real estate 1-4 family junior lien mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 11 12 22 20  
Contractual Interest Rate Reduction [Member] | Credit Card [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 89 83 186 169  
Contractual Interest Rate Reduction [Member] | Automobile [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 3 4 4 8  
Contractual Interest Rate Reduction [Member] | Other revolving credit and installment [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 12 10 23 25  
Contractual Interest Rate Reduction [Member] | Trial modifications [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Modifications, other concessions [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 510 917 1,474 1,910  
Modifications, other concessions [Member] | Total Commercial [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 288 571 918 1,199  
Modifications, other concessions [Member] | Commercial and industrial loans [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 180 449 734 937  
Modifications, other concessions [Member] | Commercial real estate mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 95 121 168 219  
Modifications, other concessions [Member] | Commercial real estate construction [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 13 1 16 4  
Modifications, other concessions [Member] | Commercial lease financing receivable [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 39  
Modifications, other concessions [Member] | Total Consumer [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 222 346 556 711  
Modifications, other concessions [Member] | Real estate 1-4 family first mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 181 286 475 592  
Modifications, other concessions [Member] | Real estate 1-4 family junior lien mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 21 30 46 58  
Modifications, other concessions [Member] | Credit Card [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Modifications, other concessions [Member] | Automobile [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 14 11 26 25  
Modifications, other concessions [Member] | Other revolving credit and installment [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 1 2 4 4  
Modifications, other concessions [Member] | Trial modifications [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 5 17 5 32  
Modification of recorded investment related to interest rate reduction [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 192 157 345 321  
Modification of recorded investment related to interest rate reduction [Member] | Total Commercial [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 58 16 71 31  
Modification of recorded investment related to interest rate reduction [Member] | Commercial and industrial loans [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 34 5 45 14  
Modification of recorded investment related to interest rate reduction [Member] | Commercial real estate mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 24 11 26 17  
Modification of recorded investment related to interest rate reduction [Member] | Commercial real estate construction [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Modification of recorded investment related to interest rate reduction [Member] | Commercial lease financing receivable [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Modification of recorded investment related to interest rate reduction [Member] | Total Consumer [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 134 141 274 290  
Modification of recorded investment related to interest rate reduction [Member] | Real estate 1-4 family first mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 19 31 38 66  
Modification of recorded investment related to interest rate reduction [Member] | Real estate 1-4 family junior lien mortgage [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 11 13 23 22  
Modification of recorded investment related to interest rate reduction [Member] | Credit Card [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 89 83 186 169  
Modification of recorded investment related to interest rate reduction [Member] | Automobile [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 3 4 4 8  
Modification of recorded investment related to interest rate reduction [Member] | Other revolving credit and installment [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 12 10 23 25  
Modification of recorded investment related to interest rate reduction [Member] | Trial modifications [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 0 0 0 0  
Troubled Debt Restructuring Outstanding Balance [Member]          
Financing Receivable, Modifications [Line Items]          
Net loans 12,600   12,600   $ 15,500
Loans remodified [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment 323 381 683 884  
Principal Forgiveness [Member]          
Primary modification type          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 3 $ 14 $ 6 $ 17