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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
| Quarter Ended September 30, 2017
(dollars in millions) | Previously Reported |  | Effect of Change Higher/(Lower) |  | As Revised
Cost of product sold | $ | 7,750 |  |  | $ | 50 |  |  | $ | 7,800 |
Cost of services sold | 3,293 |  |  | 13 |  |  | 3,306 |
Research and development | 582 |  |  | 10 |  |  | 592 |
Selling, general and administrative | 1,524 |  |  | 58 |  |  | 1,582 |
Non-service pension (benefit) | — |  |  | (131 | ) |  | (131 | )
| Nine Months Ended September 30, 2017
(dollars in millions) | Previously Reported |  | Effect of Change Higher/(Lower) |  | As Revised
Cost of product sold | $ | 22,920 |  |  | $ | 148 |  |  | $ | 23,068 |
Cost of services sold | 9,300 |  |  | 38 |  |  | 9,338 |
Research and development | 1,768 |  |  | 29 |  |  | 1,797 |
Selling, general and administrative | 4,544 |  |  | 165 |  |  | 4,709 |
Non-service pension (benefit) | — |  |  | (380 | ) |  | (380 | )
Contributions to our plans were as follows:
| Quarter Ended September 30, |  | Nine Months Ended September 30,
(dollars in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Defined benefit plans | $ | 13 |  |  | $ | 1,929 |  |  | $ | 72 |  |  | $ | 2,008 |
Defined contribution plans | 97 |  |  | 86 |  |  | 296 |  |  | 262 |
There were no contributions to our domestic defined benefit pension plans in the quarter and nine months ended September 30, 2018. There was a $1.9 billion contribution to our domestic defined benefit pension plans in the quarter and nine months ended September 30, 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 September 30, |  | Other Postretirement Benefits Quarter Ended September 30,
(dollars in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 94 |  |  | $ | 94 |  |  | $ | — |  |  | $ | — |
Interest cost | 274 |  |  | 281 |  |  | 7 |  |  | 9 |
Expected return on plan assets | (558 | ) |  | (555 | ) |  | — |  |  | — |
Amortization of prior service credit | (11 | ) |  | (9 | ) |  | — |  |  | (1 | )
Recognized actuarial net loss (gain) | 100 |  |  | 144 |  |  | (3 | ) |  | (2 | )
Net settlement and curtailment loss | 3 |  |  | 2 |  |  | — |  |  | — |
Total net periodic benefit (income) cost | $ | (98 | ) |  | $ | (43 | ) |  | $ | 4 |  |  | $ | 6 |
| Pension Benefits Nine Months Ended September 30, |  | Other Postretirement Benefits Nine Months Ended September 30,
(dollars in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 280 |  |  | $ | 280 |  |  | $ | 1 |  |  | $ | 2 |
Interest cost | 831 |  |  | 838 |  |  | 19 |  |  | 22 |
Expected return on plan assets | (1,683 | ) |  | (1,636 | ) |  | — |  |  | — |
Amortization of prior service credit | (31 | ) |  | (27 | ) |  | (2 | ) |  | (1 | )
Recognized actuarial net loss (gain) | 302 |  |  | 430 |  |  | (7 | ) |  | (7 | )
Net settlement and curtailment loss | — |  |  | 1 |  |  | — |  |  | — |
Total net periodic benefit (income) cost | $ | (301 | ) |  | $ | (114 | ) |  | $ | 11 |  |  | $ | 16 |

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