Investment in Expedia - Intangible Assets Acquired (Details) - Expedia - USD ($) $ in Millions		3 Months Ended
	Nov. 05, 2016	Sep. 30, 2017	Nov. 04, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization			$ 6,774
Goodwill expected to be tax deductible	$ 0
Goodwill, Purchase Accounting Adjustments		$ 126
Noncontrolling Interest Purchase Accounting Adjustments		167
Deferred Tax Liabilities Purchase Accounting Adjustments		$ 41
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 4,233
Useful life of intangible asset	9 years
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 1,480
Useful life of intangible asset	5 years
Supplier Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 980
Useful life of intangible asset	4 years
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 81
Other | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of intangible asset	6 years
Other | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of intangible asset	1 year