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Benefit Plans | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Benefit Plans |
Note 13 | Benefit Plans
Components of net periodic cost for pension and postretirement benefit plans
|  | Three months ended March 31,
($ in millions) |  | 2018 |  | 2017
Pension benefits |  |  |  |
Service cost |  | $ | 28 |  |  | $ | 29 |
Interest cost |  | 60 |  |  | 66 |
Expected return on plan assets |  | (105 | ) |  | (102 | )
Amortization of: |  |  |  |  |  |
Prior service credit |  | (14 | ) |  | (14 | )
Net actuarial loss |  | 44 |  |  | 47 |
Settlement loss |  | 7 |  |  | 8 |
Net periodic pension cost |  | $ | 20 |  |  | $ | 34 |
Postretirement benefits |  |  |  |
Service cost |  | $ | 2 |  |  | $ | 2 |
Interest cost |  | 3 |  |  | 4 |
Amortization of: |  |  |  |
Prior service credit |  | (5 | ) |  | (6 | )
Net actuarial gain |  | (6 | ) |  | (6 | )
Net periodic postretirement credit |  | $ | (6 | ) |  | $ | (6 | )

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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