Business Combinations - Schedule of Purchase Price Allocation (Details) $ in Millions, € in Billions		May 31, 2017 USD ($)	May 31, 2016 USD ($)	May 25, 2016 USD ($)	May 25, 2016 EUR (€)	May 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 7,154	$ 6,747			$ 3,810
TNT acquisition [Member]
Business Acquisition [Line Items]
Current assets	[1]	1,852
Property and equipment		980
Goodwill		3,452
Identifiable intangible assets		530
Other non-current assets		472
Current liabilities	[2]	(1,688)
Long-term liabilities		(704)
Total purchase price		4,894		$ 4,900	€ 4.4
TNT acquisition [Member] | Preliminary [Member]
Business Acquisition [Line Items]
Current assets	[1]		1,905
Property and equipment			1,104
Goodwill			2,964
Identifiable intangible assets			920
Other non-current assets			289
Current liabilities	[2]		(1,644)
Long-term liabilities			(644)
Total purchase price			$ 4,894
TNT acquisition [Member] | Measurement Period Adjustments [Member]
Business Acquisition [Line Items]
Current assets	[1]	(53)
Property and equipment		(124)
Goodwill		488
Identifiable intangible assets		(390)
Other non-current assets		183
Current liabilities	[2]	(44)
Long-term liabilities		$ (60)

[1] Primarily accounts receivable and cash.

[2] Primarily accounts payable and accrued expenses.