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Revenue (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of revenue from contracts with customers [Abstract]  
Disaggregation Of Revenue
Year ended Dec. 31, 2018
Canadian
Coal

US
Coal

Canadian
Gas

Australian
Gas

Wind and
Solar

Hydro

Energy
Marketing

Corporate

Total

Revenues from contracts with customers
517

9

224

91

206

132

—

—

1,179

Revenue from leases(1)
68

—

—

68

27

7

—

—

170

Revenue from derivatives
(1
)
115

4

—

(20
)
—

67

—

165

Government incentives
—

—

—

—

16

—

—

—

16

Revenue from other(2)
328

318

4

6

53

17

—

(7
)
719

Total revenue
912

442

232

165

282

156

67

(7
)
2,249

 
 
 
 
 
 
 
 
 
 
Revenues from contracts with customers
 
 
 
 
 
 
 
 
Timing of revenue recognition
 
 
 
 
 
 
 
 
 
   At a point in time
38

9

—

—

18

—

—

—

65

   Over time
479

—

224

91

188

132

—

—

1,114

Total revenue from contracts with customers
517

9

224

91

206

132

—

—

1,179

(1) Total rental income, including contingent rent related to certain PPAs and other long-term contracts that meet the criteria of operating leases. 2017 - $247 million, 2016 - $221 million.
(2) Includes merchant revenue and other miscellaneous.
Changes In Contract Liabilities
The Corporation has recognized the following revenue-related contract assets and liabilities:
Contract liabilities
Dec. 31, 2017
62

IFRS 15 transition adjustment
17

Amounts transferred to revenue included in opening balance
(10
)
Consideration received
13

Increases due to interest accrued and expensed during the period
6

Amounts transferred to payables
(1
)
Dec. 31, 2018
87