Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Long-term Debt (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Feb. 28, 2017	Aug. 31, 2016	Jun. 30, 2016
Debt Instrument [Line Items]
Face Value	$ 77,550			$ 40,949
USD Debt Issued in Period
Debt Instrument [Line Items]
Face Value		$ 17,000	$ 19,800