Commitments And Contingencies Subsequent Events (Details) $ in Millions	Sep. 30, 2018 USD ($)
Subsequent Event [Member]
Subsequent Event [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 137
Developer And Licensor - Royalty and Non-Royalty Bearing
Subsequent Event [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 790

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

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