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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
U.S. | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in net periodic benefit cost and other comprehensive loss | $ 272 | $ 160 | $ 63
U.S. | Post-retirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in net periodic benefit cost and other comprehensive loss | 2 | 2 | 0
Non-U.S. | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in net periodic benefit cost and other comprehensive loss | 261 | 311 | (147)
Non-U.S. | Post-retirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in net periodic benefit cost and other comprehensive loss | $ 13 | $ 5 | $ (5)

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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