Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Business Combinations - Additional Information (Details) £ in Millions, $ in Millions	May 01, 2019 USD ($)	Mar. 23, 2018 USD ($)	Mar. 23, 2018 GBP (£)	Oct. 13, 2017 USD ($)
P2P Mailing Limited [Member]
Business Acquisition [Line Items]
Acquisition price		$ 135	£ 92
FC (Flying Cargo) Express Ltd. [Member]
Business Acquisition [Line Items]
Acquisition price	$ 67
Northwest Research, Inc. [Member]
Business Acquisition [Line Items]
Acquisition price				$ 50