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Other Postretirement Employee Benefit Plans (Tables) - Other postretirement benefits | 12 Months Ended
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Dec. 31, 2020
Defined Benefit Plans and Other Post-Retirement Benefit Plans [Line Items] |
Funded Status Of Pension Plans | The following sets forth the funded status of the domestic plans as of the most recent actuarial valuations using measurement dates as of December 31 ($ in millions):
| 2020 |  | 2019
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ | (139) |  |  | $ | (142) |
Service cost | — |  |  | — |
Interest cost | (4) |  |  | (5) |
Actuarial gain (loss) | (15) |  |  | (4) |
Retiree contributions | (2) |  |  | (2) |
Benefits paid | 12 |  |  | 14 |
Benefit obligation at end of year | (148) |  |  | (139) |
Change in plan assets: |  |  |
Fair value of plan assets | — |  |  | — |
Funded status | $ | (148) |  |  | $ | (139) |
Weighted Average Assumptions Used To Determine Benefit Obligations And Cost | Weighted average assumptions used to determine benefit obligations at date of measurement:
| 2020 |  | 2019
Discount rate | 2.1 | % |  | 3.1 | %
Medical trend rate – initial | 5.5 | % |  | 5.7 | %
Medical trend rate – grading period | 17 years |  | 18 years
Medical trend rate – ultimate | 4.5 | % |  | 4.5 | %
Components of Net Periodic Pension Cost | Components of net periodic benefit (cost) ($ in millions):
| 2020 |  | 2019
Service cost | $ | — |  |  | $ | — |
Interest cost | (4) |  |  | (5) |
Amortization of prior service credit | 2 |  |  | 2 |
Amortization of net loss | (1) |  |  | — |
Net periodic benefit (cost) | $ | (3) |  |  | $ | (3) |
Disaggregation of Service Cost | The net periodic cost of the other postretirement employee benefit plans incurred during the years ended December 31, 2020, 2019 and 2018 are reflected in the following captions in the accompanying Consolidated Statements of Earnings ($ in millions):
| Year Ended December 31
| 2020 |  | 2019 |  | 2018
Service cost: |  |  |  |  |
Cost of sales | $ | — |  |  | $ | — |  |  | $ | — |
Selling, general and administrative expenses | — |  |  | — |  |  | (1) |
Total service cost | — |  |  | — |  |  | (1) |
Other net periodic pension costs: |  |  |  |  |
Other income (expense), net | (3) |  |  | (3) |  |  | (2) |
Total | $ | (3) |  |  | $ | (3) |  |  | $ | (3) |
Benefit Payments That Reflect Expected Future Service | The following sets forth benefit payments, which reflect expected future service, as appropriate, expected to be paid in the periods indicated ($ in millions):
2021 | $ | 15 |
2022 | 14 |
2023 | 13 |
2024 | 12 |
2025 | 11 |
2026 - 2030 | 47 |

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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 assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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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=118257860&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=118255775&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=118255775&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=118255775&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=118255775&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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