Subsequent Events Level 4 (Details) (Subsequent Event [Member], USD $)	May 27, 2015
Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Repurchased Face Amount	$ 296,000,000
Debt Instrument, Repurchase Amount	$ 320,000,000

Face (par) amount of the original debt instrument that was repurchased.

No definition available.

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