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Employee Benefit Obligations (Tables) | 3 Months Ended
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Mar. 31, 2020
Employee Benefit Obligations |
Schedule of employee benefit obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
($ in millions) | ​ | 2020 |  | 2019
​ | ​ | ​ | ​ | ​ | ​ | ​
Underfunded defined benefit pension liabilities | ​ | $ | 929 | ​ | $ | 918
Less: Current portion | ​ | ​ | (24) | ​ | ​ | (24)
Long-term defined benefit pension liabilities | ​ | ​ | 905 | ​ | ​ | 894
Long-term retiree medical liabilities | ​ | ​ | 164 | ​ | ​ | 156
Deferred compensation plans | ​ | ​ | 333 | ​ | ​ | 362
Other | ​ | ​ | 33 | ​ | ​ | 74
​ | ​ | $ | 1,435 | ​ | $ | 1,486
Components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
​ | ​ | 2020 | ​ | 2019 | ​
($ in millions) |  | U.S. |  | Foreign |  | Total |  | U.S. |  | Foreign |  | Total | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ball-sponsored plans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 16 | ​ | $ | 4 | ​ | $ | 20 | ​ | $ | 12 | ​ | $ | 3 | ​ | $ | 15 | ​
Interest cost | ​ | ​ | 20 | ​ | ​ | 14 | ​ | ​ | 34 | ​ | ​ | 25 | ​ | ​ | 18 | ​ | ​ | 43 | ​
Expected return on plan assets | ​ | ​ | (31) | ​ | ​ | (21) | ​ | ​ | (52) | ​ | ​ | (28) | ​ | ​ | (28) | ​ | ​ | (56) | ​
Amortization of prior service cost | ​ | ​ | — | ​ | ​ | 1 | ​ | ​ | 1 | ​ | ​ | — | ​ | ​ | 1 | ​ | ​ | 1 | ​
Recognized net actuarial loss | ​ | ​ | 10 | ​ | ​ | 1 | ​ | ​ | 11 | ​ | ​ | 6 | ​ | ​ | 1 | ​ | ​ | 7 | ​
Total net periodic benefit cost | ​ | $ | 15 | ​ | $ | (1) | ​ | $ | 14 | ​ | $ | 15 | ​ | $ | (5) | ​ | $ | 10 | ​

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. Also includes costs related to postemployment benefits. + References No definition available. + Details
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- References No definition available. + 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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