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Retirement Benefits - Multiemployer Pension Plans (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) project | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Multiemployer pension plans |  |  |
Company contributions to multiemployer pension plans | $ | $ 118 | $ 108 | $ 22
U.S. |  |  |
Multiemployer pension plans |  |  |
Number of nuclear power plant projects | project | 2 |  |

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- Definition Amount of contributions made to multiemployer plan by employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details
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- Details
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