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Non-Controlling Interests (Tables)
 12 Months Ended
Dec. 31, 2016
Noncontrolling Interest [Abstract]  
Schedule of Non-Controlling Interests
(in millions)
2016

2015

ITC (Note 27)
$
1,385

$
—

Waneta Partnership
330

335

Caribbean Utilities
122

122

Other
16

16

 
$
1,853

$
473