Acquisitions & Divestitures - Goodwill and Restricted Cash (Details) - USD ($) $ in Millions |
6 Months Ended | ||
|---|---|---|---|
Jun. 30, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Acquisitions | |||
| Goodwill | $ 61,645 | $ 59,617 | $ 58,222 |
| Turbonomic | |||
| Acquisitions | |||
| Weighted average useful life | 6 years 10 months 24 days | ||
| Goodwill | $ 1,444 | ||
| Estimated percent of goodwill deductible for tax purposes | 0.00% | ||
| Other Acquisitions 2021 | |||
| Acquisitions | |||
| Weighted average useful life | 6 years 4 months 24 days | ||
| Goodwill | $ 833 | ||
| Estimated percent of goodwill deductible for tax purposes | 10.00% | ||
| Global Business Services | Turbonomic | |||
| Acquisitions | |||
| Goodwill | $ 67 | ||
| Global Business Services | Other Acquisitions 2021 | |||
| Acquisitions | |||
| Goodwill | 549 | ||
| Cloud & Cognitive Software | Turbonomic | |||
| Acquisitions | |||
| Goodwill | 1,377 | ||
| Cloud & Cognitive Software | Other Acquisitions 2021 | |||
| Acquisitions | |||
| Goodwill | 283 | ||
| Global Technology Services | Other Acquisitions 2021 | |||
| Acquisitions | |||
| Goodwill | $ 2 |