Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	0 Months Ended
Mar. 31, 2014	Feb. 18, 2014 Internal Revenue Service (IRS) [Member] Tax Year 2006 [Member]
Income Tax Disclosure [Abstract]
Period for unrecognized tax benefits to decrease	12 months
Significant change within twelve months in unrecognized tax benefits, Upper Bound	$ 52
Income Tax Examination [Line Items]
IRS Notice of Deficiency tax assessment		$ 70

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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