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Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Company's pension and postretirement benefit plans |
Components of net periodic cost included in operating costs and expenses
|  | Three months ended September 30, |  | Nine months ended September 30,
($ in millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Pension benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 29 |  |  | $ | 28 |  |  | $ | 85 |  |  | $ | 85 |
Interest cost |  | 60 |  |  | 66 |  |  | 181 |  |  | 198 |
Expected return on plan assets |  | (105 | ) |  | (102 | ) |  | (316 | ) |  | (306 | )
Amortization of: |  |  |  |  |  |  |  |  |  |
Prior service credit |  | (14 | ) |  | (14 | ) |  | (42 | ) |  | (42 | )
Net actuarial loss |  | 43 |  |  | 48 |  |  | 132 |  |  | 142 |
Settlement loss |  | 68 |  |  | 94 |  |  | 82 |  |  | 110 |
Net periodic pension cost |  | $ | 81 |  |  | $ | 120 |  |  | $ | 122 |  |  | $ | 187 |
Postretirement benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 2 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 6 |
Interest cost |  | 3 |  |  | 4 |  |  | 10 |  |  | 11 |
Amortization of: |  |  |  |  |  |  |  |
Prior service credit |  | (5 | ) |  | (6 | ) |  | (16 | ) |  | (18 | )
Net actuarial gain |  | (6 | ) |  | (6 | ) |  | (17 | ) |  | (18 | )
Net periodic postretirement credit |  | $ | (6 | ) |  | $ | (6 | ) |  | $ | (17 | ) |  | $ | (19 | )
During the third quarter of 2018, the Company concluded that its qualified employee pension plan 2018 lump sum payments are expected to exceed a threshold of service and interest cost due to higher-than-expected retirement levels and rising interest rates that reduce benefit lump sum payments in the future. As a result, a pension settlement loss of $61 million, pre-tax, was recorded as part of operating costs and expenses in the Corporate and Other segment. The Company will continue to monitor lump sum payments through the end of the year and will recognize an additional settlement loss based on lump sum payments made during the fourth quarter of 2018. During the third quarter of 2017, the Company also recorded a pension settlement loss in the amount of $86 million, pre-tax, related to higher levels of lump sum payments in the qualified employee pension plan.

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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