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Restructuring and Other Charges - Summary (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Restructuring and Related Activities [Abstract] |  |  |  |
Layoff costs | $ 0 | $ 17 | $ 2 | $ 93
Net reversals of previously recorded layoff reserves | 0 | 0 | (1) | (10)
Pension, Other post-retirement benefits and Deferred Compensation - net settlements | 3 | 3 | 9 | 67
Non-cash asset impairments | 4 | 0 | 8 | 0
Net loss related to divestitures of assets and businesses | 0 | 0 | 4 | 9
Other | 1 | 2 | 0 | 7
Restructuring and other charges | $ 8 | $ 22 | $ 22 | $ 166

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