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Loans And Allowance For Credit Losses (Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 1 $ 7 $ 2 $ 7 $ 84 $ 139  
Financing Receivable, Recorded Investment, Current 43,840   43,840       $ 42,340
Loans held for sale 71   71       172
Commercial and industrial 14,041   14,041       13,452
Leasing 343   343       423
Owner occupied 7,082   7,082       6,962
Municipal 1,073   1,073       778
Construction and land development 2,170   2,170       2,019
Term 8,944   8,944       9,322
Loans Receivable, Gross, Commercial, Real Estate 11,114   11,114       11,341
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,745   2,745       2,645
1-4 family residential 6,522   6,522       5,891
Loans and Leases Receivable, Gross, Consumer, Construction 558   558       486
Bankcard and other revolving plans 490   490       481
Other 188   188       190
Loans and Leases Receivable, Gross 44,156   44,156       42,649
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 122   122       150
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 194   194       159
Financing Receivable, Recorded Investment, Past Due 316   316       309
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 30   30       36
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 265   265       381
Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 10,503   10,503       9,693
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,745   2,745       2,645
1-4 family residential 6,522   6,522       5,891
Loans and Leases Receivable, Gross, Consumer, Construction 558   558       486
Bankcard and other revolving plans 490   490       481
Other 188   188       190
Loans and Leases Receivable, Gross 10,503   10,503       9,693
Financing Receivable, Recorded Investment, Nonaccrual Status 1   1       0
Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Construction and land development 2,170   2,170       2,019
Term 8,944   8,944       9,322
Loans Receivable, Gross, Commercial, Real Estate 11,114   11,114       11,341
Financing Receivable, Recorded Investment, Nonaccrual Status 6   6       7
Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Commercial and industrial 14,041   14,041       13,452
Leasing 343   343       423
Owner occupied 7,082   7,082       6,962
Municipal 1,073   1,073       778
Loans and Leases Receivable, before Fees, Gross 22,539   22,539       21,615
Loans and Leases Receivable, Gross 22,539   22,539       21,615
Pass [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 42,349   42,349       40,564
Pass [Member] | Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 10,431   10,431       9,629
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,728   2,728       2,629
1-4 family residential 6,475   6,475       5,851
Loans and Leases Receivable, Gross, Consumer, Construction 554   554       482
Bankcard and other revolving plans 487   487       478
Other 187   187       189
Pass [Member] | Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Construction and land development 2,140   2,140       1,942
Term 8,697   8,697       9,096
Loans Receivable, Gross, Commercial, Real Estate 10,837   10,837       11,038
Pass [Member] | Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Commercial and industrial 12,987   12,987       12,185
Leasing 325   325       387
Owner occupied 6,697   6,697       6,560
Municipal 1,072   1,072       765
Loans and Leases Receivable, before Fees, Gross 21,081   21,081       19,897
Special Mention [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 559   559       508
Special Mention [Member] | Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 0   0       0
Loans and Leases Receivable, Gross, Consumer, Home Equity 0   0       0
1-4 family residential 0   0       0
Loans and Leases Receivable, Gross, Consumer, Construction 0   0       0
Bankcard and other revolving plans 0   0       0
Other 0   0       0
Special Mention [Member] | Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Construction and land development 24   24       52
Term 84   84       82
Loans Receivable, Gross, Commercial, Real Estate 108   108       134
Special Mention [Member] | Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Commercial and industrial 357   357       266
Leasing 1   1       5
Owner occupied 93   93       96
Municipal 0   0       7
Loans and Leases Receivable, before Fees, Gross 451   451       374
Total Allowance [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 541   541       567
Total Allowance [Member] | Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 49   49       31
Total Allowance [Member] | Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans Receivable, Gross, Commercial, Real Estate 107   107       116
Total Allowance [Member] | Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 385   385       420
Doubtful [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 2   2       4
Doubtful [Member] | Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 0   0       0
Loans and Leases Receivable, Gross, Consumer, Home Equity 0   0       0
1-4 family residential 0   0       0
Loans and Leases Receivable, Gross, Consumer, Construction 0   0       0
Bankcard and other revolving plans 0   0       0
Other 0   0       0
Doubtful [Member] | Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Construction and land development 0   0       0
Term 0   0       0
Loans Receivable, Gross, Commercial, Real Estate 0   0       0
Doubtful [Member] | Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Commercial and industrial 2   2       3
Leasing 0   0       1
Owner occupied 0   0       0
Municipal 0   0       0
Loans and Leases Receivable, before Fees, Gross 2   2       4
Substandard [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 1,246   1,246       1,573
Substandard [Member] | Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 72   72       64
Loans and Leases Receivable, Gross, Consumer, Home Equity 17   17       16
1-4 family residential 47   47       40
Loans and Leases Receivable, Gross, Consumer, Construction 4   4       4
Bankcard and other revolving plans 3   3       3
Other 1   1       1
Substandard [Member] | Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Construction and land development 6   6       25
Term 163   163       144
Loans Receivable, Gross, Commercial, Real Estate 169   169       169
Substandard [Member] | Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Commercial and industrial 695   695       998
Leasing 17   17       30
Owner occupied 292   292       306
Municipal 1   1       6
Loans and Leases Receivable, before Fees, Gross 1,005   1,005       1,340
loans held for sale [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 58   58       172
Loans and Leases Receivable, Gross 71   71       172
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 0   0       0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 13   13       0
Financing Receivable, Recorded Investment, Past Due 13   13       0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0       0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 0   0       40
Commercial And Industrial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 13,870   13,870       13,306
Loans and Leases Receivable, Gross 14,041   14,041       13,452
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 53   53       72
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 118   118       74
Financing Receivable, Recorded Investment, Past Due 171   171       146
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 17   17       10
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 150   150       287
Consumer Loan [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 10,450   10,450       9,638
Loans and Leases Receivable, Gross 10,503   10,503       9,693
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 28   28       22
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 25   25       33
Financing Receivable, Recorded Investment, Past Due 53   53       55
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 5   5       5
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 26   26       17
Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 185   185       189
Loans and Leases Receivable, Gross 188   188       190
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 3   3       1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0   0       0
Financing Receivable, Recorded Investment, Past Due 3   3       1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0       0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 1   1       0
Term [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 8,925   8,925       9,291
Loans and Leases Receivable, Gross 8,944   8,944       9,322
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 8   8       9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 11   11       22
Financing Receivable, Recorded Investment, Past Due 19   19       31
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 2   2       12
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 30   30       18
Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 2,158   2,158       2,010
Loans and Leases Receivable, Gross 2,170   2,170       2,019
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 6   6       7
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 6   6       2
Financing Receivable, Recorded Investment, Past Due 12   12       9
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1   1       1
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 1   1       1
Finance Leases Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 343   343       423
Loans and Leases Receivable, Gross 343   343       423
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 0   0       0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0   0       0
Financing Receivable, Recorded Investment, Past Due 0   0       0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0       0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 8   8       14
Owner Occupied [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 7,021   7,021       6,894
Loans and Leases Receivable, Gross 7,082   7,082       6,962
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 27   27       40
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 34   34       28
Financing Receivable, Recorded Investment, Past Due 61   61       68
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 5   5       8
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 49   49       43
Municipal [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 1,073   1,073       778
Loans and Leases Receivable, Gross 1,073   1,073       778
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 0   0       0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0   0       0
Financing Receivable, Recorded Investment, Past Due 0   0       0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0       0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 1   1       1
Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 11,083   11,083       11,301
Loans and Leases Receivable, Gross 11,114   11,114       11,341
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 14   14       16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 17   17       24
Financing Receivable, Recorded Investment, Past Due 31   31       40
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 3   3       13
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 31   31       19
Home Equity Line of Credit [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 2,735   2,735       2,635
Loans and Leases Receivable, Gross 2,745   2,745       2,645
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 6   6       4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 4   4       6
Financing Receivable, Recorded Investment, Past Due 10   10       10
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0       1
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 4   4       5
Commercial Loan [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 22,307   22,307       21,401
Loans and Leases Receivable, Gross 22,539   22,539       21,615
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 80   80       112
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 152   152       102
Financing Receivable, Recorded Investment, Past Due 232   232       214
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 22   22       18
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 208   208       345
One Through Four Family Residential [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 6,497   6,497       5,857
Loans and Leases Receivable, Gross 6,522   6,522       5,891
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 10   10       12
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 15   15       22
Financing Receivable, Recorded Investment, Past Due 25   25       34
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0       0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 20   20       11
Construction And Other Consumer Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 547   547       479
Loans and Leases Receivable, Gross 558   558       486
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 6   6       3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 5   5       4
Financing Receivable, Recorded Investment, Past Due 11   11       7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 4   4       3
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 0   0       0
Commercial and Industrial Sector [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status $ 257   $ 257       $ 354
[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.