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Restructuring and Other Charges - Summary (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Restructuring and Related Activities [Abstract] |  |  |  |
Layoff costs | $ 2 | $ 54 | $ 2 | $ 76
Net reversals of previously recorded layoff reserves | (2) | (8) | (1) | (10)
Pension, Other post-retirement benefits and Deferred Compensation - net settlements (G) | 3 | 64 | 6 | 64
Non-cash asset impairments | 4 | 0 | 4 | 0
Net loss related to divestitures of assets and businesses (Q) | 0 | (7) | 4 | 9
Other | (2) | 2 | (1) | 5
Restructuring and other charges | $ 5 | $ 105 | $ 14 | $ 144

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