XML 41 R20.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Benefit Plans | 6 Months Ended
--- | ---
Jun. 30, 2018
Retirement Benefits [Abstract] |
Benefit Plans |
Note 13 | Benefit Plans
Components of net periodic cost included in operating costs and expenses
|  | Three months ended June 30, |  | Six months ended June 30,
($ in millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Pension benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 28 |  |  | $ | 28 |  |  | $ | 56 |  |  | $ | 57 |
Interest cost |  | 61 |  |  | 66 |  |  | 121 |  |  | 132 |
Expected return on plan assets |  | (106 | ) |  | (102 | ) |  | (211 | ) |  | (204 | )
Amortization of: |  |  |  |  |  |  |  |  |  |
Prior service credit |  | (14 | ) |  | (14 | ) |  | (28 | ) |  | (28 | )
Net actuarial loss |  | 45 |  |  | 47 |  |  | 89 |  |  | 94 |
Settlement loss |  | 7 |  |  | 8 |  |  | 14 |  |  | 16 |
Net periodic pension cost |  | $ | 21 |  |  | $ | 33 |  |  | $ | 41 |  |  | $ | 67 |
Postretirement benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 2 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 4 |
Interest cost |  | 4 |  |  | 3 |  |  | 7 |  |  | 7 |
Amortization of: |  |  |  |  |  |  |  |
Prior service credit |  | (6 | ) |  | (6 | ) |  | (11 | ) |  | (12 | )
Net actuarial gain |  | (5 | ) |  | (6 | ) |  | (11 | ) |  | (12 | )
Net periodic postretirement credit |  | $ | (5 | ) |  | $ | (7 | ) |  | $ | (11 | ) |  | $ | (13 | )

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 The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
Name: | us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration