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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill |
(in millions) | 2016 |  | 2015 |
Balance, beginning of year | $ | 4,173 |  | $ | 3,732 |
Acquisition of ITC (Note 2 7) | 8,106 |  | — |
Acquisition of Aitken Cree k (Note 27) | 27 |  | — |
Foreign currency translation impacts | 58 |  | 441 |
Balance, end of year | $ | 12,364 |  | $ | 4,173 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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