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QUARTERLY INFORMATION (unaudited) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information [Line Items] |  |
Impact of pension mark-to-market | $ 800 | $ 2,651
Income tax benefit attributable to the 2017 Tax Cuts and Jobs Act | 258 |
Increase (decrease) in net income | $ 349 | $ 1,673
Increase (Decrease) In Earnings Per Share Basic | $ 0.41 | $ 1.91
Increase (Decrease) In Earnings Per Share Diluted | $ 0.40 | $ 1.91
U.S. Domestic Package |  |
Quarterly Financial Information [Line Items] |  |
Impact of pension mark-to-market | $ 637 | $ 1,908
International Package |  |
Quarterly Financial Information [Line Items] |  |
Impact of pension mark-to-market | 35 | 425
Supply Chain & Freight |  |
Quarterly Financial Information [Line Items] |  |
Impact of pension mark-to-market | $ 128 | $ 318

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