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Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of cash flow statement [Abstract]  
Disclosure of non-cash operating working capital
Year ended Dec. 31
2018

2017

2016

(Use) source:
 

 

 

Accounts receivable
58

(228
)
(23
)
Prepaid expenses
19

(75
)
5

Income taxes receivable
—

8

(4
)
Inventory
(21
)
(7
)
11

Accounts payable, accrued liabilities, and provisions
(97
)
186

81

Income taxes payable
(3
)
2

3

Change in non-cash operating working capital
(44
)
(114
)
73
Cash flows from (used in) operating activities [Text Block]
 
Balance Dec. 31, 2017

Net cash flows

New leases

Dividends declared

Foreign exchange impact

Other

Balance Dec. 31, 2018

Long-term debt and finance lease
  obligations
3,707

(540
)
10

—

95

(5
)
3,267

Dividends payable (common and
  preferred)
34

(86
)
—

107

—

3

58

Total liabilities from financing activities
3,741

(626
)
10

107

95

(2
)
3,325

 
Balance
Dec. 31, 2016

Net 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