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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost

The components of net periodic benefit cost for the Company’s retirement plans were:

 

    Three Months Ended June 30             Six Months Ended June 30  
    Pension Plans     Postretirement
Welfare Plan		             Pension Plans     Postretirement
Welfare Plan		  
(Dollars in Millions)       2018         2017         2018         2017                 2018         2017         2018         2017  

Service cost

   $ 52     $ 46     $ –     $ –          $ 104     $ 93     $ –     $ –  

Interest cost

     56       55       –       1            112       110       1       2  

Expected return on plan assets

     (94 )      (71 )      (1 )      –            (189 )      (142 )      (2 )      (1 ) 

Prior service cost (credit) amortization

     –       –       –       (1 )           –       (1 )      (1 )      (2 ) 

Actuarial loss (gain) amortization

     36       32       (1 )      (2 )               73       64       (3 )      (3 ) 

Net periodic benefit cost (a)

   $ 50     $ 62     $ (2 )    $ (2 )             $ 100     $ 124     $ (5 )    $ (4 ) 

 

(a) Service cost is included in employee benefits expense on the Consolidated Statement of Income. All other components are included in other noninterest expense on the Consolidated Statement of Income.