Investments Cost Method Investments (Details) - USD ($) $ in Millions	Sep. 02, 2015	Sep. 30, 2016	Oct. 27, 2009	Jul. 29, 2008
New Cubs LLC
Line of Credit Facility [Line Items]
Ownership percentage in common stock			5.00%
Deferred tax liability		$ 160
New Cubs LLC | Payment Guarantee
Line of Credit Facility [Line Items]
Guarantor maximum exposure			$ 699
Newsday LLC
Line of Credit Facility [Line Items]
Ownership percentage in common stock	3.00%			3.00%
Proceeds from sale of cost method investment	$ 8
Gain on sale of cost method investment	3
Deferred tax liability	$ 101