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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning balance | $ 52 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 99 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 227 us-gaap_FinancingReceivableAllowanceForCreditLosses
Decrease to allowance | (10)us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease | (47)us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease | (10)us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease
Amounts written-off | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | (118)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Ending balance | $ 42 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 52 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 99 us-gaap_FinancingReceivableAllowanceForCreditLosses

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- 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

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- 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

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

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- 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