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QUARTERLY INFORMATION (unaudited) - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2015 USD ($) item $ / shares | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) $ / shares | Jun. 30, 2014 USD ($) $ / shares
Quarterly Financial Information [Line Items] |  |  |  |
Impact of pension mark-to-market | $ 118 |  | $ 1,062 |
Increase (decrease) in net income | $ 79 |  | $ 670 |
Increase (decrease) in basic and diluted earnings per share | $ / shares | $ 0.09 |  | $ 0.74 |
Number of items impacting operating profit | item | 2 |  |  |
Basic | $ / shares |  |  |  | $ 0.73
Diluted | $ / shares |  |  |  | $ 0.72
U.S. Domestic Package |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |
Impact of pension mark-to-market | $ 62 |  | $ 660 |
International Package |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |
Impact of pension mark-to-market | 44 |  | 200 |
Supply Chain & Freight |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |
Impact of pension mark-to-market | 12 |  | 202 |
National Master Agreement (NMA) [Domain] |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |
Increase (decrease) in net income |  |  |  | $ 665
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments |  | $ 1,066 |  | 1,066
Non-National Master Agreement (Non-NMA) [Domain] |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |
Increase (decrease) in net income |  |  | $ 22 |
Increase (decrease) in basic and diluted earnings per share | $ / shares |  |  | $ 0.02 |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments | $ 36 |  | $ 36 |
Non-National Master Agreement (Non-NMA) [Domain] | U.S. Domestic Package |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments |  |  | 33 |
Non-National Master Agreement (Non-NMA) [Domain] | International Package |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments |  |  | 1 |
Non-National Master Agreement (Non-NMA) [Domain] | Supply Chain & Freight |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments |  |  | $ 2 |
Supply Chain & Freight |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments |  |  |  | 82
International Package |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments |  |  |  | 27
U.S. Domestic Package |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments |  |  |  | $ 957

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