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QUARTERLY INFORMATION (unaudited) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2018
Quarterly Financial Information [Line Items] |  |  |  |  |  |
Transformation cost |  | $ 97 | $ 263 |  |  |
Retirement cost |  |  | 192 |  |  |
Other transformation related costs |  |  | 71 |  |  | $ 262
Impact of pension mark-to-market | $ 1,627 |  |  | $ 800 |  |
Income tax benefit attributable to the 2017 Tax Cuts and Jobs Act |  |  |  | 258 |  |
Increase (decrease) in net income | $ 0 | $ (73) | $ (200) | $ (349) |  |
Increase (Decrease) In Earnings Per Share Basic | $ 1.43 | $ (0.09) | $ (0.24) | $ (0.41) |  |
Increase (Decrease) In Earnings Per Share Diluted | $ 1.42 | $ (0.09) | $ (0.23) | $ (0.40) |  |
U.S. Domestic Package |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |
Transformation cost |  | $ 39 |  |  | $ 196 |
International Package |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |
Transformation cost |  | 40 |  |  | 36 |
Supply Chain & Freight |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |
Transformation cost |  | $ 18 |  |  | $ 31 |

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