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Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of cash flow statement [Abstract]  
Disclosure of non-cash operating working capital
Year ended Dec. 31
2017

2016

2015

(Use) source:
 

 

 

Accounts receivable
(228
)
(23
)
(77
)
Prepaid expenses
(75
)
5

(3
)
Income taxes receivable
8

(4
)
1

Inventory
(7
)
11

(9
)
Accounts payable, accrued liabilities, and provisions
186

81

(152
)
Income taxes payable
2

3

(2
)
Change in non-cash operating working capital
(114
)
73

(242
)
Cash flows from (used in) operating activities [Text Block]
Cash Flow Information
A. Change in Non-Cash Operating Working Capital
Year ended Dec. 31
2017

2016

2015

(Use) source:
 

 

 

Accounts receivable
(228
)
(23
)
(77
)
Prepaid expenses
(75
)
5

(3
)
Income taxes receivable
8

(4
)
1

Inventory
(7
)
11

(9
)
Accounts payable, accrued liabilities, and provisions
186

81

(152
)
Income taxes payable
2

3

(2
)
Change in non-cash operating working capital
(114
)
73

(242
)

B. Changes in Liabilities from Financing Activities
 
Balance
Dec. 31, 2016

Cash flows

New leases

Dividends declared

Foreign exchange impact

Other

Balance
Dec. 31, 2017

Long-term debt and finance lease
  obligations
4,361

(545
)
14

—

(115
)
(8
)
3,707

Dividends payable (common and
  preferred)
54

(86
)
—

64

—

2

34

Total liabilities from financing activities
4,415

(631
)
14

64

(115
)
(6
)
3,741