| (Dollars in millions),"Year Ended December 31,.2021","Year Ended December 31,.2020","Year Ended December 31,.2019",2021 vs. 2020 Change.$,2021 vs. 2020 Change.%,2020 vs. 2019 Change.$,2020 vs. 2019 Change.% | |
| Research and development,"$ 2,593","$ 1,491","$ 1,343","$ 1,102",74%,$ 148,11% | |
| As a percentage of revenues,5%,5%,5%,,,, | |