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Company Restructuring - Restructuring Programs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and related charges | $ 23 | $ 196 | $ 145 | $ 213 |
Future work environment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected program charges | 110 |  | 110 |  |
Restructuring and related charges |  |  | (108) |  | $ 0
Change in estimated program costs in 2021 | 30 |  | 30 |  |
Remaining program charges | 32 |  | 32 |  |
Transformative Growth |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected program charges | 290 |  | 290 |  |
Restructuring and related charges |  |  | 7 |  | $ (238)
Change in estimated program costs in 2021 | (52) |  | (52) |  |
Remaining program charges | $ 7 |  | $ 7 |  |

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