Business Combinations - Schedule of Intangible Assets with Finite Lives (Details) - TNT Express Intangible [Member] $ in Millions	12 Months Ended
	May 31, 2017 USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 530
Customer Relationships [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets with finite lives	430
Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets with finite lives	20
Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets with finite lives	$ 80