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CONSOLIDATED STATEMENTS OF INCOME
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Transmission revenues $ 422 $ 426 [1],[2] $ 417 [1]
Equity earnings (Note 5) 124 97 [1] 97 [1]
Impairment of equity-method investment (Note 5)     (199) [1]
Operation and maintenance expenses (67) (58) [1],[2] (61) [1]
Property taxes (28) (27) [1],[2] (27) [1]
General and administrative (8) (7) [1],[2] (9) [1]
Depreciation (97) (96) [1] (95) [1]
Financial charges and other (Note 12) (82) (71) [1] (63) [1]
Net income before taxes 264 264 [1],[2] 60 [1]
Income taxes (Note 24) (1) (1) [1],[2] (2) [1]
Net Income 263 [3] 263 [2] 58 [2]
Net income attributable to non-controlling interests 11 15 [1],[2] 21 [1]
Net income attributable to controlling interests 252 248 [1] 37 [1]
Net income attributable to controlling interest allocation (Note 13)      
General Partner 16 11 [1],[2] 3 [1]
TransCanada and its subsidiaries 17 26 [1],[2] 36 [1]
Net income attributable to controlling interests 252 248 [1] 37 [1]
Common Units      
Net income attributable to controlling interest allocation (Note 13)      
Net income (loss) attributable to common units $ 219 $ 211 [1] $ (2) [1]
Net income per common unit (Note 13) - basic (in dollars per unit) | $ / shares $ 3.16 [4] $ 3.21 [1],[4] $ (0.03) [1],[4]
Net income per common unit (Note 13) - diluted (in dollars per unit) | $ / shares $ 3.16 $ 3.21 $ (0.03)
Weighted average common units outstanding - basic (in units) | shares 69.2 65.7 [1] 63.9 [1]
Weighted average common units outstanding - diluted (in units) | shares 69.2 65.7 63.9
Common units outstanding, end of year (in units) | shares 70.6 67.4 [1],[2] 64.3 [1]
[1] Recast to consolidate PNGTS (Refer to Notes 2 and 7).
[2] Recast to consolidate PNGTS (Refer to Notes 2 and 7).
[3] Recast to consolidate PNGTS (Refer to Notes 2 and 7).
[4] Net income per common unit prior to recast (Refer to Note 2).