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Restructuring and Other Charges - Schedule of Restructuring and Other Charges (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring and Related Activities [Abstract] |  |  |
Layoff costs | $ 113 | $ 69 | $ 18
Reversals of and adjustments to previously recorded layoff reserves | (21) | (6) | (8)
Pension, Other post-retirement benefits (costs) and deferred compensation - net settlement and curtailments | 69 | (7) | 91
Non-cash asset impairments (O) | 5 | 442 | 9
Net loss on divestitures of assets and businesses (U) | 8 | 63 | 43
Other | 8 | 21 | 10
Restructuring and other charges | $ 182 | $ 582 | $ 163

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