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Fair Values of Assets and Liabilities (Tables)
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Valuation Assumption Ranges for MSRs

The following table shows the significant valuation assumption ranges for MSRs at December 31, 2017:

 

     Minimum      Maximum      Average  

Expected prepayment

    6      17      10

Option adjusted spread

    7        10        8  
Valuation Assumption Ranges for Derivative Commitments

The following table shows the significant valuation assumption ranges for the Company’s derivative commitments to purchase and originate mortgage loans at December 31, 2017:

 

     Minimum      Maximum      Average  

Expected loan close rate

    6      100      80

Inherent MSR value (basis points per loan)

    (1      184        117  
Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table summarizes the balances of assets and liabilities measured at fair value on a recurring basis:

 

(Dollars in Millions)   Level 1        Level 2        Level 3        Netting        Total  

December 31, 2017

                     

Available-for-sale securities

                     

U.S. Treasury and agencies

  $ 22,572        $ 729        $        $        $ 23,301  

Mortgage-backed securities

                     

Residential

                     

Agency

             38,031                            38,031  

Commercial

                     

Agency

             6                            6  

Asset-backed securities

                     

Other

             419                            419  

Obligations of state and political

                     

subdivisions

             6,358                            6,358  

Other investments

    22                                     22  

Total available-for-sale

    22,594          45,543                            68,137  

Mortgage loans held for sale

             3,534                            3,534  

Mortgage servicing rights

                      2,645                   2,645  

Derivative assets

    6          1,960          516          (652        1,830  

Other assets

    154          1,163                            1,317  

Total

  $ 22,754        $ 52,200        $ 3,161        $ (652      $ 77,463  

Derivative liabilities

  $        $ 1,958        $ 409        $ (1,130      $ 1,237  

Short-term borrowings and other liabilities(c)

    101          894                            995  

Total

  $ 101        $ 2,852        $ 409        $ (1,130      $ 2,232  

December 31, 2016

                     

Available-for-sale securities

                     

U.S. Treasury and agencies

  $ 16,355        $ 772        $        $        $ 17,127  

Mortgage-backed securities

                     

Residential

                     

Agency

             43,138                            43,138  

Non-agency

                     

Prime(a)

                      242                   242  

Non-prime(b)

                      195                   195  

Commercial

                     

Agency

             15                            15  

Asset-backed securities

                     

Other

             481          2                   483  

Obligations of state and political subdivisions

             5,039                            5,039  

Corporate debt securities

                      9                   9  

Other investments

    36                                     36  

Total available-for-sale

    16,391          49,445          448                   66,284  

Mortgage loans held for sale

             4,822                            4,822  

Mortgage servicing rights

                      2,591                   2,591  

Derivative assets

             2,416          554          (984        1,986  

Other assets

    183          1,137                            1,320  

Total

  $ 16,574        $ 57,820        $ 3,593        $ (984      $ 77,003  

Derivative liabilities

  $ 7        $ 2,469        $ 383        $ (1,185      $ 1,674  

Short-term borrowings and other liabilities(c)

    142          938                            1,080  

Total

  $ 149        $ 3,407        $ 383        $ (1,185      $ 2,754  
(a) Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
(b) Includes all securities not meeting the conditions to be designated as prime.
(c) Primarily represents the Company’s obligation on securities sold short required to be accounted for at fair value per applicable accounting guidance.
Changes in Fair Value for All Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)

The following table presents the changes in fair value for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the years ended December 31:

 

(Dollars in Millions)   Beginning
of Period
Balance
    Net Gains
(Losses)
Included in
Net Income
    Net Gains
(Losses)
Included in
Other
Comprehensive
Income (Loss)
    Purchases     Sales     Principal
Payments
    Issuances     Settlements    

End of
Period

Balance

   

Net Change
in Unrealized
Gains (Losses)
Relating to
Assets and
Liabilities

Held at

End of Period

 

2017

                   

Available-for-sale securities

                   

Mortgage-backed securities

                   

Residential non-agency

                   

Prime(a)

  $ 242     $     $ (2   $     $ (234   $ (6   $     $     $     $  

Non-prime(b)

    195             (17           (175     (3                        

Asset-backed securities

                   

Other

    2                         (2                              

Corporate debt securities

    9             2             (11                              

Total available-for-sale

    448             (17 )(e)            (422     (9                        

Mortgage servicing rights

    2,591       (404 )(c)            13                   445 (f)            2,645       (404 )(c) 

Net derivative assets and liabilities

    171       317 (d)            1       (10                 (372     107       (52 )(g) 

2016

                   

Available-for-sale securities

                   

Mortgage-backed securities

                   

Residential non-agency

                   

Prime(a)

  $ 318     $ (1   $     $     $     $ (75   $     $     $ 242     $  

Non-prime(b)

    240       (1     (2                 (42                 195       (2

Asset-backed securities

                   

Other

    2                                                 2        

Corporate debt securities

    9                                                 9        

Total available-for-sale

    569       (2 )(h)      (2 )(e)                  (117                 448       (2

Mortgage servicing rights

    2,512       (488 )(c)            43                   524 (f)            2,591       (488 )(c) 

Net derivative assets and liabilities

    498       332 (i)            2       (14                 (647     171       (257 )(j) 

2015

                   

Available-for-sale securities

                   

Mortgage-backed securities

                   

Residential non-agency

                   

Prime(a)

  $ 405     $     $ (4   $     $     $ (83   $     $     $ 318     $ (4

Non-prime(b)

    280       (1     (1                 (38                 240       (1

Asset-backed securities

                   

Other

    62       4       (2           (51     (11                 2        

Corporate debt securities

    9                                                 9        

Total available-for-sale

    756       3 (k)      (7 )(e)            (51     (132                 569       (5

Mortgage servicing rights

    2,338       (487 )(c)            29                   632 (f)            2,512       (487 )(c) 

Net derivative assets and liabilities

    574       707 (l)            1       (13                 (771     498       135 (m) 
(a) Prime securities are those designated as such by the issuer at origination. When an issuer designation is unavailable, the Company determines at acquisition date the categorization based on asset pool characteristics (such as weighted-average credit score, loan-to-value, loan type, prevalence of low documentation loans) and deal performance (such as pool delinquencies and security market spreads).
(b) Includes all securities not meeting the conditions to be designated as prime.
(c) Included in mortgage banking revenue.
(d) Approximately $21 million included in other noninterest income and $296 million included in mortgage banking revenue.
(e) Included in changes in unrealized gains and losses on securities available-for-sale.
(f) Represents MSRs capitalized during the period.
(g) Approximately $(77) million included in other noninterest income and $25 million included in mortgage banking revenue.
(h) Approximately $(3) million included in securities gains (losses) and $1 million included in interest income.
(i) Approximately $(77) million included in other noninterest income and $409 million included in mortgage banking revenue.
(j) Approximately $(276) million included in other noninterest income and $19 million included in mortgage banking revenue.
(k) Included in interest income.
(l) Approximately $289 million included in other noninterest income and $418 million included in mortgage banking revenue.
(m) Approximately $92 million included in other noninterest income and $43 million included in mortgage banking revenue.
Adjusted Carrying Values for Assets Measured at Fair Value on Nonrecurring Basis

The following table summarizes the balances as of the measurement date of assets measured at fair value on a nonrecurring basis, and still held as of December 31:

 

    2017      2016  
(Dollars in Millions)   Level 1        Level 2        Level 3        Total      Level 1        Level 2        Level 3        Total  

Loans(a)

  $        $        $ 150        $ 150      $        $        $ 59        $ 59  

Other assets(b)

                      31          31                          60          60  
(a) Represents the carrying value of loans for which adjustments were based on the fair value of the collateral, excluding loans fully charged-off.
(b) Primarily represents the fair value of foreclosed properties that were measured at fair value based on an appraisal or broker price opinion of the collateral subsequent to their initial acquisition.
Losses Recognized Related to Nonrecurring Fair Value Measurements of Individual Assets or Portfolios

The following table summarizes losses recognized related to nonrecurring fair value measurements of individual assets or portfolios for the years ended December 31:

 

(Dollars in Millions)   2017        2016        2015  

Loans(a)

  $ 171        $ 192        $ 175  

Other assets(b)

    20          32          42  
(a) Represents write-downs of student loans held for sale based on non-binding quoted prices received for the portfolio that were subsequently transferred to loans, and write-downs of loans which were based on the fair value of the collateral, excluding loans fully charged-off.
(b) Primarily represents related losses of foreclosed properties that were measured at fair value subsequent to their initial acquisition.
Differences Between Aggregate Fair Value Carrying Amount of MLHFS for which Fair Value Option has been Elected and Aggregate Unpaid Principal Amount Contractually Obligated to Receive at Maturity

The following table summarizes the differences between the aggregate fair value carrying amount of MLHFS for which the fair value option has been elected and the aggregate unpaid principal amount that the Company is contractually obligated to receive at maturity as of December 31:

 

    2017      2016  
(Dollars in Millions)   Fair Value
Carrying
Amount
       Aggregate
Unpaid
Principal
       Carrying
Amount Over
(Under) Unpaid
Principal
     Fair Value
Carrying
Amount
       Aggregate
Unpaid
Principal
       Carrying
Amount Over
(Under) Unpaid
Principal
 

Total loans

  $ 3,534        $ 3,434        $ 100      $ 4,822        $ 4,763        $ 59  

Nonaccrual loans

    1          2          1        2          3          (1

Loans 90 days or more past due

    1          1                 1          1           
Estimated Fair Values of Financial Instruments

The estimated fair values of the Company’s financial instruments as of December 31, are shown in the table below:

 

    2017     2016  
    Carrying
Amount
    Fair Value     Carrying
Amount
    Fair Value  
(Dollars in Millions)     Level 1     Level 2     Level 3     Total       Level 1     Level 2     Level 3     Total  
                     

Financial Assets

                     

Cash and due from banks

  $ 19,505     $ 19,505     $     $     $ 19,505     $ 15,705     $ 15,705     $     $     $ 15,705  

Federal funds sold and securities purchased under resale agreements

    93             93             93       138             138             138  

Investment securities held-to-maturity

    44,362       4,613       39,095       15       43,723       42,991       4,605       37,810       20       42,435  

Loans held for sale(a)

    20                   20       20       4                   4       4  

Loans

    276,507                   279,391       279,391       269,394                   273,422       273,422  

Other financial instruments

    2,393             1,037       1,364       2,401       2,362             920       1,449       2,369  
 

Financial Liabilities

                     

Deposits

    347,215             346,979             346,979       334,590             334,361             334,361  

Short-term borrowings(b)

    15,656             15,447             15,447       12,891             12,706             12,706  

Long-term debt

    32,259             32,377             32,377       33,323             33,678             33,678  

Other liabilities

    1,556                   1,556       1,556       1,702                   1,702       1,702  
(a) Excludes mortgages held for sale for which the fair value option under applicable accounting guidance was elected.
(b) Excludes the Company’s obligation on securities sold short required to be accounted for at fair value per applicable accounting guidance.