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Commitments and Contingent Liabilities Commitments and Contingent Liabilities (Maximum Potential Obligation) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Commitment Period Two Thousand Twenty Six [Member] |  |
Other Commitments [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 500 | $ 500
Commitment Period Two Thousand Thirty Three [Member] |  |
Other Commitments [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 1,850 | 1,350
Commitment Period Two Thousand Thirty Four [Member] |  |
Other Commitments [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 2,000 | 0
Commitment Period Two Thousand Thirty Six [Member] |  |
Other Commitments [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 1,250 | $ 1,250

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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