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Supplementary Information to Consolidated Statements of Cash Flows (Tables)
 12 Months Ended
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]  
Supplementary Information to Consolidated Statements of Cash Flows
(in millions)
2016

2015

Cash paid for:
 
 
Interest
$
644

$
561

Income taxes
62

109

 
 
 
Change in non-cash operating working capital:
 
 
Accounts receivable and other current assets
$
43

$
14

Prepaid expenses
(4
)
(1
)
Inventories
17

15

Regulatory assets - current portion
(58
)
57

Accounts payable and other current liabilities
25

(82
)
Regulatory liabilities - current portion
(1
)
38

 
$
22

$
41

 
 
 
Non-cash investing and financing activities:
 
 
Common share dividends reinvested
$
162

$
156

Common shares issued on business acquisition (Notes 17 and 27)
4,684

—

Additions to utility capital assets and intangible assets included in
   current and long-term liabilities
296

187

Commitment to purchase capital lease interest (Note 15)
48

—

Transfer of deposit on business acquisition (Note 27)
38

—

Contributions in aid of construction included in current assets
9

4

Exercise of stock options into common shares
4

4