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QUARTERLY INFORMATION (unaudited) - Transformation and Other Costs (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Legal Contingencies and Expenses | $ 97 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Defined Benefit Plan Mark-to-Market Charges | 2,387 | 0 | 0 | 0 | 1,627 | 0 | 0 | 0
Transformation Strategy - Employee Benefits |  |  |  |  |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Transformation cost | 17 | 41 | 2 | 106 | 0 | 70 | 192 | 0
Transformation Strategy - Other Costs |  |  |  |  |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Transformation cost | 31 | 22 | 19 | 17 | 0 | 27 | 71 | 0
U.S. Domestic Package |  |  |  |  |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Transformation cost | 133 | 26 | 18 | 28 | 0 | 39 | 196 | 0
International Package |  |  |  |  |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Transformation cost | 10 | 26 | 2 | 84 | 0 | 40 | 36 | 0
Supply Chain & Freight |  |  |  |  |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |
Transformation cost | $ 2 | $ 11 | $ 1 | $ 11 | $ 0 | $ 18 | $ 31 | $ 0

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