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Summary of Accounting Principles (Collaborative Arrangements) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Collaborators interests existing programs low end | 14.00% |  |
Collaborators interests existing programs high end | 50.00% |  |
Partner share individual program maximum | 31.00% |  |
Cost of Products Sold [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Collaborator Share Of Sales | $ 1,789 | $ 1,700 | $ 1,547
Collaborator Share Of Program Costs | 143 | 108 | 104
Cost of Services Sold [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Collaborator Share Of Sales | 929 | 675 | 652
Research and Development [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Collaborator Share Of Program Costs | 190 | 184 | 248
Selling General and Administrative [Member] |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Collaborator Share Of Program Costs | $ 74 | $ 57 | $ 53

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- Definition Income statement amounts attributable to program costs transactions arising from the collaborative arrangement between participants for each period an income statement is presented. + References No definition available. + Details
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- Definition High end of collaborators' interests in existing engine production programs. + References No definition available. + Details
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- Details
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