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Significant Restructuring Costs Change in Restructuring Reserve - 2020 Restructuring Plan (Details) $ in Millions | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 USD ($) Employees | Dec. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) Employees
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs | $ 0 | $ 111 |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  | $ 62 |
Number of employees to be severed | Employees |  |  |  | 6,500
Number of employees severed | Employees | 4,700 |  |  | 4,700
Building Solutions North America Retail [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Goodwill, Impairment Loss |  |  | 424 |
2020 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  | 297 |
Payments for Restructuring | $ (28) |  | (95) |
Restructuring Reserve, Settled without Cash |  |  | (96) |
Currency Translation | 1 |  | 2 |
Restructuring Reserve | 81 |  | 108 | $ 81
Employee Severance | 2020 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  | 196 |
Payments for Restructuring | (26) |  | (92) |
Restructuring Reserve, Settled without Cash |  |  | 0 |
Currency Translation | 1 |  | 2 |
Restructuring Reserve | 81 |  | 106 | 81
Long-Lived Asset Impairment | 2020 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  | 96 |
Payments for Restructuring | 0 |  | 0 |
Restructuring Reserve, Settled without Cash |  |  | (96) |
Currency Translation | 0 |  | 0 |
Restructuring Reserve | 0 |  | 0 | 0
Other Restructuring | 2020 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  | 5 |
Payments for Restructuring | (2) |  | (3) |
Restructuring Reserve, Settled without Cash |  |  | 0 |
Currency Translation | 0 |  | 0 |
Restructuring Reserve | $ 0 |  | 2 | $ 0
Global Products | 2020 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  | 136 |
Building Solutions North America | 2020 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  | 64 |
Building Solutions Asia Pacific | 2020 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  | 49 |
Building Solutions EMEA/LA | 2020 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  | 43 |
Corporate Segment | 2020 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  | $ 5 |

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