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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 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 18 $ 7 $ 129 $ 180  
Financing Receivable, Recorded Investment, Current 42,353   42,353   $ 42,340
Loans held for sale 128   128   172
Commercial and industrial 13,368   13,368   13,452
Leasing 404   404   423
Owner occupied 6,973   6,973   6,962
Municipal 811   811   778
Construction and land development 2,123   2,123   2,019
Term 9,083   9,083   9,322
Loans Receivable, Gross, Commercial, Real Estate 11,206   11,206   11,341
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,638   2,638   2,645
1-4 family residential 6,185   6,185   5,891
Loans and Leases Receivable, Gross, Consumer, Construction 517   517   486
Bankcard and other revolving plans 459   459   481
Other 181   181   190
Loans and Leases Receivable, Gross 42,742   42,742   42,649
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 197   197   150
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 192   192   159
Financing Receivable, Recorded Investment, Past Due 389   389   309
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 30   30   36
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 331   331   381
Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable before Fees, Gross 9,980   9,980   9,693
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,638   2,638   2,645
1-4 family residential 6,185   6,185   5,891
Loans and Leases Receivable, Gross, Consumer, Construction 517   517   486
Bankcard and other revolving plans 459   459   481
Other 181   181   190
Loans and Leases Receivable, Gross 9,980   9,980   9,693
Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Construction and land development 2,123   2,123   2,019
Term 9,083   9,083   9,322
Loans Receivable, Gross, Commercial, Real Estate 11,206   11,206   11,341
Financing Receivable, Recorded Investment, Nonaccrual Status 7   7   7
Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Commercial and industrial 13,368   13,368   13,452
Leasing 404   404   423
Owner occupied 6,973   6,973   6,962
Municipal 811   811   778
Loans and Leases Receivable before Fees, Gross 21,556   21,556   21,615
Loans and Leases Receivable, Gross 21,556   21,556   21,615
Pass [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable, Gross 40,730   40,730   40,564
Pass [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable before Fees, Gross 9,915   9,915   9,629
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,620   2,620   2,629
1-4 family residential 6,143   6,143   5,851
Loans and Leases Receivable, Gross, Consumer, Construction 515   515   482
Bankcard and other revolving plans 457   457   478
Other 180   180   189
Pass [Member] | Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Construction and land development 2,043   2,043   1,942
Term 8,843   8,843   9,096
Loans Receivable, Gross, Commercial, Real Estate 10,886   10,886   11,038
Pass [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Commercial and industrial 12,175   12,175   12,185
Leasing 376   376   387
Owner occupied 6,573   6,573   6,560
Municipal 805   805   765
Loans and Leases Receivable before Fees, Gross 19,929   19,929   19,897
Special Mention [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable, Gross 548   548   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 23   23   52
Term 111   111   82
Loans Receivable, Gross, Commercial, Real Estate 134   134   134
Special Mention [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Commercial and industrial 305   305   266
Leasing 5   5   5
Owner occupied 104   104   96
Municipal 0   0   7
Loans and Leases Receivable before Fees, Gross 414   414   374
Total Allowance [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable, Gross 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 33   33   31
Total Allowance [Member] | Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans Receivable, Gross, Commercial, Real Estate 114   114   116
Total Allowance [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable before Fees, Gross 397   397   420
Doubtful [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable, Gross 1   1   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 1   1   3
Leasing 0   0   1
Owner occupied 0   0   0
Municipal 0   0   0
Loans and Leases Receivable before Fees, Gross 1   1   4
Substandard [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable, Gross 1,463   1,463   1,573
Substandard [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable before Fees, Gross 65   65   64
Loans and Leases Receivable, Gross, Consumer, Home Equity 18   18   16
1-4 family residential 42   42   40
Loans and Leases Receivable, Gross, Consumer, Construction 2   2   4
Bankcard and other revolving plans 2   2   3
Other 1   1   1
Substandard [Member] | Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Construction and land development 57   57   25
Term 129   129   144
Loans Receivable, Gross, Commercial, Real Estate 186   186   169
Substandard [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Commercial and industrial 887   887   998
Leasing 23   23   30
Owner occupied 296   296   306
Municipal 6   6   6
Loans and Leases Receivable before Fees, Gross 1,212   1,212   1,340
loans held for sale [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 113   113    
Loans and Leases Receivable, Gross 128   128    
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 15   15    
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0   0   0
Financing Receivable, Recorded Investment, Past Due 15   15    
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0    
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 19   19    
Consumer Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 9,925   9,925   9,638
Loans and Leases Receivable, Gross 9,980   9,980   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 27   27   33
Financing Receivable, Recorded Investment, Past Due 55   55   55
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 4   4   5
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 15   15   17
Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 180   180   189
Loans and Leases Receivable, Gross 181   181   190
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 1   1   1
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0   0   0
Financing Receivable, Recorded Investment, Past Due 1   1   1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 0   0   0
Term [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 9,047   9,047   9,291
Loans and Leases Receivable, Gross 9,083   9,083   9,322
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 11   11   9
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 25   25   22
Financing Receivable, Recorded Investment, Past Due 36   36   31
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 14   14   12
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 24   24   18
Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 2,113   2,113   2,010
Loans and Leases Receivable, Gross 2,123   2,123   2,019
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 3   3   7
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 7   7   2
Financing Receivable, Recorded Investment, Past Due 10   10   9
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   1
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 0   0   1
Finance Leases Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 401   401   423
Loans and Leases Receivable, Gross 404   404   423
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 2   2   0
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 1   1   0
Financing Receivable, Recorded Investment, Past Due 3   3   0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 11   11   14
Owner Occupied [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 6,880   6,880   6,894
Loans and Leases Receivable, Gross 6,973   6,973   6,962
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 59   59   40
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 34   34   28
Financing Receivable, Recorded Investment, Past Due 93   93   68
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 3   3   8
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 35   35   43
Municipal [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 811   811   778
Loans and Leases Receivable, Gross 811   811   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 11,160   11,160   11,301
Loans and Leases Receivable, Gross 11,206   11,206   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 32   32   24
Financing Receivable, Recorded Investment, Past Due 46   46   40
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 14   14   13
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 24   24   19
Home Equity Line of Credit [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 2,626   2,626   2,635
Loans and Leases Receivable, Gross 2,638   2,638   2,645
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 7   7   4
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 5   5   6
Financing Receivable, Recorded Investment, Past Due 12   12   10
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 2   2   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 21,268   21,268   21,401
Loans and Leases Receivable, Gross 21,556   21,556   21,615
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 155   155   112
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 133   133   102
Financing Receivable, Recorded Investment, Past Due 288   288   214
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 12   12   18
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 292   292   345
One Through Four Family Residential [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 6,156   6,156   5,857
Loans and Leases Receivable, Gross 6,185   6,185   5,891
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 11   11   12
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 18   18   22
Financing Receivable, Recorded Investment, Past Due 29   29   34
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 11   11   11
Construction And Other Consumer Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 509   509   479
Loans and Leases Receivable, Gross 517   517   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 2   2   4
Financing Receivable, Recorded Investment, Past Due 8   8   7
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1   1   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, Current 13,176   13,176   13,306
Loans and Leases Receivable, Gross 13,368   13,368   13,452
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 94   94   72
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 98   98   74
Financing Receivable, Recorded Investment, Past Due 192   192   146
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 9   9   10
Financing Receivable, Recorded Investment, Nonaccrual Status 358   358   354
Commercial and Industrial Sector [Member] | Commercial And Industrial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Nonaccrual Status [1] $ 245   $ 245   $ 287
[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.