Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Foreign currency forward contracts [Member]
Derivative [Line Items]
Notional amount	$ 927	$ 635
Cross-currency swap contracts [Member]
Derivative [Line Items]
Notional amount	168	168
Fair Value Hedging [Member] \| Interest rate swap [Member]
Derivative [Line Items]
Deferred (gain) loss on discontinuation of fair value hedge	$ (35)

Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective fair value hedge that is amortized upon discontinuation of the fair value hedge.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 35

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6439857&loc=d3e75592-113984

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