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Benefit Plans | 6 Months Ended
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Jun. 30, 2017
Retirement Benefits [Abstract] |
Benefit Plans | Benefit Plans The components of net periodic cost for the Company’s pension and postretirement benefit plans are as follows:
($ in millions) | Three months ended June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Pension benefits |  |  |  |  |  |  |
Service cost | $ | 28 |  |  | $ | 28 |  |  | $ | 57 |  |  | $ | 56 |
Interest cost | 66 |  |  | 72 |  |  | 132 |  |  | 143 |
Expected return on plan assets | (102 | ) |  | (100 | ) |  | (204 | ) |  | (199 | )
Amortization of: |  |  |  |  |  |  |  |  |
Prior service credit | (14 | ) |  | (14 | ) |  | (28 | ) |  | (28 | )
Net actuarial loss | 47 |  |  | 44 |  |  | 94 |  |  | 87 |
Settlement loss | 8 |  |  | 8 |  |  | 16 |  |  | 16 |
Net periodic pension cost | $ | 33 |  |  | $ | 38 |  |  | $ | 67 |  |  | $ | 75 |
Postretirement benefits |  |  |  |  |  |  |
Service cost | $ | 2 |  |  | $ | 3 |  |  | $ | 4 |  |  | $ | 5 |
Interest cost | 3 |  |  | 5 |  |  | 7 |  |  | 9 |
Amortization of: |  |  |  |  |  |  |
Prior service credit | (6 | ) |  | (6 | ) |  | (12 | ) |  | (11 | )
Net actuarial gain | (6 | ) |  | (8 | ) |  | (12 | ) |  | (16 | )
Net periodic postretirement credit | $ | (7 | ) |  | $ | (6 | ) |  | $ | (13 | ) |  | $ | (13 | )

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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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