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Retirement Benefits (Schedule of Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Domestic Plan | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in net periodic benefit cost and other comprehensive loss (income) | $ (10) | $ 31 | $ 146
Domestic Plan | Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in net periodic benefit cost and other comprehensive loss (income) | 5 | 2 | (138)
Foreign Plan | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in net periodic benefit cost and other comprehensive loss (income) | (513) | 21 | (407)
Foreign Plan | Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in net periodic benefit cost and other comprehensive loss (income) | $ (14) | $ 10 | $ (2)

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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 + Details
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