Contingencies and Commitments Gain Contingencies (Details) (USD $) In Millions, unless otherwise specified	2 Months Ended
Mar. 31, 2015
Gain Contingencies [Line Items]
Proceeds from Legal Settlements	$ 67us-gaap_ProceedsFromLegalSettlements

Cash received for the settlement of litigation during the current period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585

Name:	us-gaap_ProceedsFromLegalSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration