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Finance Assets, net (Schedule of Allowance for Losses on Finance Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 52us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 99us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 227us-gaap_FinancingReceivableAllowanceForCreditLosses
Decrease to allowance	(10)us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	(47)us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	(10)us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease
Amounts written-off	0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs	0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs	(118)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Ending balance	$ 42us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 52us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 99us-gaap_FinancingReceivableAllowanceForCreditLosses

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

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

X

- Definition

The increase (decrease) in the allowance for credit losses related to financing receivables.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

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