Condensed Consolidated Statements of Cash Flows (Unaudited) - Reconciliation of Cash, Cash Equivalents, and Restricted Cash - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018
Current Assets:
Cash and cash equivalents	$ 2,009	$ 1,886
Restricted cash included in prepaid expenses and other	127	48
Noncurrent Assets:
Cash restricted for airport construction	893	1,326
Total cash, cash equivalents and restricted cash equivalents	$ 3,029	$ 3,260

Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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