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Research and Development Expenditures (Tables) | 9 Months Ended
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Sep. 30, 2019
Research and Development [Abstract] |
Gross and net expenditures on research and development ("R&D") activities |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Gross R&D expenditures | $ | 123 |  |  | $ | 122 |  |  | $ | 372 |  |  | $ | 386 |
Customer reimbursements | (21 | ) |  | (14 | ) |  | (53 | ) |  | (49 | )
Net R&D expenditures | $ | 102 |  |  | $ | 108 |  |  | $ | 319 |  |  | $ | 337 |

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