XML 47 R32.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Benefit Plans (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2017
Retirement Benefits [Abstract] |
Company's pension and postretirement 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 September 30, |  | Nine months ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Pension benefits |  |  |  |  |  |  |
Service cost | $ | 28 |  |  | $ | 28 |  |  | $ | 85 |  |  | $ | 84 |
Interest cost | 66 |  |  | 71 |  |  | 198 |  |  | 214 |
Expected return on plan assets | (102 | ) |  | (99 | ) |  | (306 | ) |  | (298 | )
Amortization of: |  |  |  |  |  |  |  |  |
Prior service credit | (14 | ) |  | (14 | ) |  | (42 | ) |  | (42 | )
Net actuarial loss | 48 |  |  | 44 |  |  | 142 |  |  | 131 |
Settlement loss | 94 |  |  | 7 |  |  | 110 |  |  | 23 |
Net periodic pension cost | $ | 120 |  |  | $ | 37 |  |  | $ | 187 |  |  | $ | 112 |
Postretirement benefits |  |  |  |  |  |  |
Service cost | $ | 2 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 7 |
Interest cost | 4 |  |  | 4 |  |  | 11 |  |  | 13 |
Amortization of: |  |  |  |  |  |  |
Prior service credit | (6 | ) |  | (5 | ) |  | (18 | ) |  | (16 | )
Net actuarial gain | (6 | ) |  | (2 | ) |  | (18 | ) |  | (18 | )
Net periodic postretirement credit | $ | (6 | ) |  | $ | (1 | ) |  | $ | (19 | ) |  | $ | (14 | )

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration