Annual report pursuant to Section 13 and 15(d)

QUARTERLY INFORMATION (unaudited) - Transformation and Other Costs (Details)

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QUARTERLY INFORMATION (unaudited) - Transformation and Other Costs (Details) - USD ($)
$ in Millions
3 Months Ended
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