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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Employee Benefit Plans Pension and Postretirement Plans. We sponsor both funded and unfunded domestic and foreign defined pension and other postretirement benefit plans, and defined contribution plans. In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits (Topic 715), Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. This ASU requires an employer to report the service cost component of net periodic pension benefit cost in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period, with other cost components presented separately from the service cost component and outside of income from operations. This ASU also allows only the service cost component of net periodic pension benefit cost to be eligible for capitalization when applicable. This ASU was effective for years beginning after December 15, 2017. The Company adopted this standard on January 1, 2018 applying the presentation requirements retrospectively. We elected to apply the practical expedient, which allows us to reclassify amounts disclosed previously in the employee benefit plans note as the basis for applying retrospective presentation for comparative periods as it is impracticable to determine the disaggregation of the cost components for amounts capitalized and amortized in those periods. Provisions related to presentation of the service cost component eligibility for capitalization were applied prospectively. The effect of the retrospective presentation change related to the net periodic benefit cost of our defined benefit pension and postretirement plans on our condensed consolidated statement of operations was as follows:
| Quarter Ended June 30, 2017
(dollars in millions) | Previously Reported |  | Effect of Change Higher/(Lower) |  | As Revised
Cost of product sold | $ | 7,907 |  |  | $ | 50 |  |  | $ | 7,957 |
Cost of services sold | 3,193 |  |  | 14 |  |  | 3,207 |
Research and development | 609 |  |  | 10 |  |  | 619 |
Selling, general and administrative | 1,538 |  |  | 52 |  |  | 1,590 |
Non-service pension (benefit) | — |  |  | (126 | ) |  | (126 | )
| Six Months Ended June 30, 2017
(dollars in millions) | Previously Reported |  | Effect of Change Higher/(Lower) |  | As Revised
Cost of product sold | 15,170 |  |  | 98 |  |  | 15,268 |
Cost of services sold | 6,007 |  |  | 25 |  |  | 6,032 |
Research and development | 1,186 |  |  | 19 |  |  | 1,205 |
Selling, general and administrative | 3,020 |  |  | 107 |  |  | 3,127 |
Non-service pension (benefit) | — |  |  | (249 | ) |  | (249 | )
Contributions to our plans were as follows:
| Quarter Ended June 30, |  | Six Months Ended June 30,
(dollars in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Defined benefit plans | $ | 22 |  |  | $ | 33 |  |  | $ | 59 |  |  | $ | 79 |
Defined contribution plans | 105 |  |  | 86 |  |  | 199 |  |  | 176 |
There were no contributions to our domestic defined benefit pension plans in the quarter and six months ended June 30, 2018 and 2017. The following table illustrates the components of net periodic benefit cost for our defined pension and other postretirement benefit plans:
| Pension Benefits Quarter Ended June 30, |  | Other Postretirement Benefits Quarter Ended June 30,
(dollars in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 93 |  |  | $ | 93 |  |  | $ | — |  |  | $ | 1 |
Interest cost | 278 |  |  | 279 |  |  | 6 |  |  | 6 |
Expected return on plan assets | (562 | ) |  | (541 | ) |  | — |  |  | — |
Amortization of prior service credit | (10 | ) |  | (9 | ) |  | (1 | ) |  | — |
Recognized actuarial net loss (gain) | 101 |  |  | 143 |  |  | (2 | ) |  | (2 | )
Net settlement and curtailment gain | (2 | ) |  | (2 | ) |  | — |  |  | — |
Total net periodic benefit (income) cost | $ | (102 | ) |  | $ | (37 | ) |  | $ | 3 |  |  | $ | 5 |
| Pension Benefits Six Months Ended June 30, |  | Other Postretirement Benefits Six Months Ended June 30,
(dollars in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 186 |  |  | $ | 186 |  |  | $ | 1 |  |  | $ | 2 |
Interest cost | 557 |  |  | 557 |  |  | 12 |  |  | 13 |
Expected return on plan assets | (1,125 | ) |  | (1,081 | ) |  | — |  |  | — |
Amortization of prior service credit | (20 | ) |  | (18 | ) |  | (2 | ) |  | — |
Recognized actuarial net loss (gain) | 202 |  |  | 286 |  |  | (4 | ) |  | (5 | )
Net settlement and curtailment gain | (3 | ) |  | (1 | ) |  | — |  |  | — |
Total net periodic benefit (income) cost | $ | (203 | ) |  | $ | (71 | ) |  | $ | 7 |  |  | $ | 10 |
As approved in 2016, effective January 1, 2017, a voluntary lump-sum option is available for the frozen final average earnings benefits of certain U.S. salaried employees upon termination of employment after 2016. This option provides participants with the choice of electing to receive a lump-sum payment in lieu of receiving a future monthly pension benefit. This plan change reduced the projected benefit obligation by $170 million as of December 31, 2016.

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- 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
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