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Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | $ 58 | $ 59 | $ 93
Cash payments | (49) | (65) | (86)
Restructuring charges | 124 | 65 | 97
Other | 108 | 1 | 45
Restructuring reserve ending balance | 25 | 58 | 59
Restructuring and other charges | (9) | (165) | (155)
Layoff costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 56 | 50 | 84
Cash payments | (47) | (59) | (73)
Restructuring charges | 111 | 64 | 70
Other | 110 | (1) | 31
Restructuring reserve ending balance | 10 | 56 | 50
Reversal of prior restructuring charges |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Other | 25 |  |
Restructuring and other charges | 19 | 11 |
Reclassification of a stock awards reversal |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring and other charges |  | (13) |
Reclassification of pension costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Other | 2 |  |
Restructuring and other charges | (119) |  |
Effects of foreign currency translation and other |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Other | 4 |  | (1)
Credit in post-retirement costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring and other charges | (28) |  |
Other exit costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 2 | 9 | 9
Cash payments | (2) | (6) | (13)
Restructuring charges | 13 | 1 | 27
Other | (2) | 2 | 14
Restructuring reserve ending balance | 15 | 2 | 9
Restructuring and other charges | (19) | $ (69) | (57)
Reclassification of asset retirement obligation |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring and other charges |  |  | 8
Reclassification of environmental obligation |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring and other charges |  |  | 2
Reclassification of legal obligations |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring and other charges |  |  | $ 4
Minimum | Contract Termination |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve ending balance | 5 |  |
Maximum | Contract Termination |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve ending balance | $ 7 |  |

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