Financial Instruments (Commercial Aerospace Financing Commitments) (Details) (USD $) In Billions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Commercial Aerospace [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset	$ 12.1	$ 10.9
International Aero Engines AG [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset	$ 6.5	$ 5.8

The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

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