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Goodwill (Tables)
 12 Months Ended
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 27)
8,106

—

Acquisition of Aitken Creek (Note 27)
27

—

Foreign currency translation impacts
58

441

Balance, end of year
$
12,364

$
4,173