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Pensions and Other Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Net Periodic Benefit Cost | The net periodic pension and other postretirement benefit costs for the three and six months ended June 30, 2020 and 2019 were as follows:
| Pension |  |  |  |  |  |
| Three Months Ended June 30 |  |  |  | Six Months Ended June 30 |  |
($ in millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $6 |  |  | $5 |  |  | $12 |  |  | $11 |
Interest cost | 21 |  |  | 27 |  |  | 43 |  |  | 53 |
Expected return on plan assets | (36) |  |  | (35) |  |  | (72) |  |  | (70) |
Amortization of actuarial losses | 18 |  |  | 16 |  |  | 36 |  |  | 31 |
Curtailments | 1 |  |  | — |  |  | 1 |  |  | — |
Net periodic benefit cost | $10 |  |  | $13 |  |  | $20 |  |  | $25 |
Defined Contribution Plan Disclosures |
| Three Months Ended June 30 |  |  |  | Six Months Ended June 30 |  |
($ in millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Non-U.S. defined benefit pension mandatory contributions | $3 |  |  | $3 |  |  | $5 |  |  | $6 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of defined contribution pension plans or defined contribution other postretirement plans, separately for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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