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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 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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 $ 3 $ 19 $ 3 $ 21 $ 123 $ 162  
Financing Receivable, Recorded Investment, Current 43,418   43,418   43,418   $ 42,340
Loans held for sale 53   53   53   172
Commercial and industrial 13,850   13,850   13,850   13,452
Leasing 387   387   387   423
Owner occupied 7,095   7,095   7,095   6,962
Municipal 871   871   871   778
Construction and land development 2,186   2,186   2,186   2,019
Term 9,012   9,012   9,012   9,322
Loans Receivable, Gross, Commercial, Real Estate 11,198   11,198   11,198   11,341
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,697   2,697   2,697   2,645
1-4 family residential 6,359   6,359   6,359   5,891
Loans and Leases Receivable, Gross, Consumer, Construction 560   560   560   486
Bankcard and other revolving plans 478   478   478   481
Other 188   188   188   190
Loans and Leases Receivable, Gross 43,683   43,683   43,683   42,649
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 124   124   124   150
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 141   141   141   159
Financing Receivable, Recorded Investment, Past Due 265   265   265   309
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 19   19   19   36
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 325   325   325   381
Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 10,282   10,282   10,282   9,693
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,697   2,697   2,697   2,645
1-4 family residential 6,359   6,359   6,359   5,891
Loans and Leases Receivable, Gross, Consumer, Construction 560   560   560   486
Bankcard and other revolving plans 478   478   478   481
Other 188   188   188   190
Loans and Leases Receivable, Gross 10,282   10,282   10,282   9,693
Financing Receivable, Recorded Investment, Nonaccrual Status 1   1   1   0
Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Construction and land development 2,186   2,186   2,186   2,019
Term 9,012   9,012   9,012   9,322
Loans Receivable, Gross, Commercial, Real Estate 11,198   11,198   11,198   11,341
Financing Receivable, Recorded Investment, Nonaccrual Status 6   6   6   7
Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Commercial and industrial 13,850   13,850   13,850   13,452
Leasing 387   387   387   423
Owner occupied 7,095   7,095   7,095   6,962
Municipal 871   871   871   778
Loans and Leases Receivable, before Fees, Gross 22,203   22,203   22,203   21,615
Loans and Leases Receivable, Gross 22,203   22,203   22,203   21,615
Pass [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 41,777   41,777   41,777   40,564
Pass [Member] | Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 10,209   10,209   10,209   9,629
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,679   2,679   2,679   2,629
1-4 family residential 6,309   6,309   6,309   5,851
Loans and Leases Receivable, Gross, Consumer, Construction 559   559   559   482
Bankcard and other revolving plans 475   475   475   478
Other 187   187   187   189
Pass [Member] | Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Construction and land development 2,101   2,101   2,101   1,942
Term 8,763   8,763   8,763   9,096
Loans Receivable, Gross, Commercial, Real Estate 10,864   10,864   10,864   11,038
Pass [Member] | Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Commercial and industrial 12,760   12,760   12,760   12,185
Leasing 364   364   364   387
Owner occupied 6,715   6,715   6,715   6,560
Municipal 865   865   865   765
Loans and Leases Receivable, before Fees, Gross 20,704   20,704   20,704   19,897
Special Mention [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 589   589   589   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   0
Loans and Leases Receivable, Gross, Consumer, Home Equity 0   0   0   0
1-4 family residential 0   0   0   0
Loans and Leases Receivable, Gross, Consumer, Construction 0   0   0   0
Bankcard and other revolving plans 0   0   0   0
Other 0   0   0   0
Special Mention [Member] | Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Construction and land development 28   28   28   52
Term 111   111   111   82
Loans Receivable, Gross, Commercial, Real Estate 139   139   139   134
Special Mention [Member] | Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Commercial and industrial 336   336   336   266
Leasing 1   1   1   5
Owner occupied 113   113   113   96
Municipal 0   0   0   7
Loans and Leases Receivable, before Fees, Gross 450   450   450   374
Total Allowance [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 544   544   544   567
Total Allowance [Member] | Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 35   35   35   31
Total Allowance [Member] | Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans Receivable, Gross, Commercial, Real Estate 116   116   116   116
Total Allowance [Member] | Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 393   393   393   420
Doubtful [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 0   0   0   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   0
Loans and Leases Receivable, Gross, Consumer, Home Equity 0   0   0   0
1-4 family residential 0   0   0   0
Loans and Leases Receivable, Gross, Consumer, Construction 0   0   0   0
Bankcard and other revolving plans 0   0   0   0
Other 0   0   0   0
Doubtful [Member] | Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Construction and land development 0   0   0   0
Term 0   0   0   0
Loans Receivable, Gross, Commercial, Real Estate 0   0   0   0
Doubtful [Member] | Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Commercial and industrial 0   0   0   3
Leasing 0   0   0   1
Owner occupied 0   0   0   0
Municipal 0   0   0   0
Loans and Leases Receivable, before Fees, Gross 0   0   0   4
Substandard [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 1,317   1,317   1,317   1,573
Substandard [Member] | Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, before Fees, Gross 73   73   73   64
Loans and Leases Receivable, Gross, Consumer, Home Equity 18   18   18   16
1-4 family residential 50   50   50   40
Loans and Leases Receivable, Gross, Consumer, Construction 1   1   1   4
Bankcard and other revolving plans 3   3   3   3
Other 1   1   1   1
Substandard [Member] | Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Construction and land development 57   57   57   25
Term 138   138   138   144
Loans Receivable, Gross, Commercial, Real Estate 195   195   195   169
Substandard [Member] | Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Commercial and industrial 754   754   754   998
Leasing 22   22   22   30
Owner occupied 267   267   267   306
Municipal 6   6   6   6
Loans and Leases Receivable, before Fees, Gross 1,049   1,049   1,049   1,340
loans held for sale [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 50   50   50   172
Loans and Leases Receivable, Gross 53   53   53   172
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 0   0   0   0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 3   3   3   0
Financing Receivable, Recorded Investment, Past Due 3   3   3   0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 9   9   9   40
Commercial And Industrial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 13,735   13,735   13,735   13,306
Loans and Leases Receivable, Gross 13,850   13,850   13,850   13,452
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 54   54   54   72
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 61   61   61   74
Financing Receivable, Recorded Investment, Past Due 115   115   115   146
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 10   10   10   10
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 216   216   216   287
Consumer Loan [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 10,225   10,225   10,225   9,638
Loans and Leases Receivable, Gross 10,282   10,282   10,282   9,693
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 26   26   26   22
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 31   31   31   33
Financing Receivable, Recorded Investment, Past Due 57   57   57   55
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 3   3   3   5
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 21   21   21   17
Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 187   187   187   189
Loans and Leases Receivable, Gross 188   188   188   190
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 1   1   1   1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0   0   0   0
Financing Receivable, Recorded Investment, Past Due 1   1   1   1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 0   0   0   0
Term [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 8,990   8,990   8,990   9,291
Loans and Leases Receivable, Gross 9,012   9,012   9,012   9,322
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 12   12   12   9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 10   10   10   22
Financing Receivable, Recorded Investment, Past Due 22   22   22   31
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 3   3   3   12
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 24   24   24   18
Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 2,175   2,175   2,175   2,010
Loans and Leases Receivable, Gross 2,186   2,186   2,186   2,019
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 6   6   6   7
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 5   5   5   2
Financing Receivable, Recorded Investment, Past Due 11   11   11   9
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0   1
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 1   1   1   1
Finance Leases Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 387   387   387   423
Loans and Leases Receivable, Gross 387   387   387   423
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 0   0   0   0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0   0   0   0
Financing Receivable, Recorded Investment, Past Due 0   0   0   0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 10   10   10   14
Owner Occupied [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 7,035   7,035   7,035   6,894
Loans and Leases Receivable, Gross 7,095   7,095   7,095   6,962
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 26   26   26   40
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 34   34   34   28
Financing Receivable, Recorded Investment, Past Due 60   60   60   68
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 3   3   3   8
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 52   52   52   43
Municipal [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 871   871   871   778
Loans and Leases Receivable, Gross 871   871   871   778
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 0   0   0   0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0   0   0   0
Financing Receivable, Recorded Investment, Past Due 0   0   0   0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 1   1   1   1
Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 11,165   11,165   11,165   11,301
Loans and Leases Receivable, Gross 11,198   11,198   11,198   11,341
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 18   18   18   16
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 15   15   15   24
Financing Receivable, Recorded Investment, Past Due 33   33   33   40
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 3   3   3   13
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 25   25   25   19
Home Equity Line of Credit [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 2,684   2,684   2,684   2,635
Loans and Leases Receivable, Gross 2,697   2,697   2,697   2,645
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 6   6   6   4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 7   7   7   6
Financing Receivable, Recorded Investment, Past Due 13   13   13   10
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 2   2   2   1
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 4   4   4   5
Commercial Loan [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 22,028   22,028   22,028   21,401
Loans and Leases Receivable, Gross 22,203   22,203   22,203   21,615
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 80   80   80   112
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 95   95   95   102
Financing Receivable, Recorded Investment, Past Due 175   175   175   214
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 13   13   13   18
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 279   279   279   345
One Through Four Family Residential [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 6,328   6,328   6,328   5,857
Loans and Leases Receivable, Gross 6,359   6,359   6,359   5,891
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 10   10   10   12
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 21   21   21   22
Financing Receivable, Recorded Investment, Past Due 31   31   31   34
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 17   17   17   11
Construction And Other Consumer Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Current 553   553   553   479
Loans and Leases Receivable, Gross 560   560   560   486
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 6   6   6   3
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 1   1   1   4
Financing Receivable, Recorded Investment, Past Due 7   7   7   7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0   3
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 0   0   0   0
Commercial and Industrial Sector [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status $ 278   $ 278   $ 278   $ 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.