Severance - Severance Liabilities (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2014 Employee Severance [Member]	Dec. 31, 2013 Employee Severance [Member]	Mar. 31, 2014 Other Severance Charges [Member]	Sep. 30, 2014 Other Severance Charges [Member]	Sep. 30, 2014 Other Segment [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 53	$ 16	$ 2
Severance Charges Expense	2					19
Payments for Restructuring	(36)			(4)	(7)
Ending Balance	$ 17	$ 16	$ 2

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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