Derivative Financial Instruments Schedule of Notional Amounts of Net Investment Hedges (Details) - EUR (€) € in Millions		1 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Net Investment Hedging [Member] \| Foreign Currency Denominated Debt [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount of Nonderivative Instruments	€ 850	€ 328

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration