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Company Restructuring - Restructuring Programs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and related charges | $ 71 | $ 13 | $ 122 | $ 17 |
Future work environment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected program charges | 110 |  | 110 |  |
Restructuring and related charges |  |  | (79) |  | $ 0
Change in estimated program costs | 0 |  | 0 |  |
Remaining program charges | 31 |  | 31 |  |
Transformative Growth |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected program charges | 290 |  | 290 |  |
Restructuring and related charges |  |  | 1 |  | $ (238)
Change in estimated program costs | (40) |  | (40) |  |
Remaining program charges | $ 13 |  | $ 13 |  |

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