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Decommissioning and Other Provisions (Tables)
 12 Months Ended
Dec. 31, 2017
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Change in decommissioning and other provision balances
The change in decommissioning and other provision balances is as follows:
 
Decommissioning and
restoration

Other

Total

Balance, Dec. 31, 2015
233

165

398

Liabilities incurred
11

12

23

Liabilities settled
(23
)
(36
)
(59
)
Accretion
19

1

20

Revisions in estimated cash flows
12

5

17

Revisions in discount rates
44

—

44

Reversals
—

(96
)
(96
)
Change in foreign exchange rates
(3
)
(1
)
(4
)
Balance, Dec. 31, 2016
293

50

343

Liabilities incurred
3

19

22

Liabilities settled
(19
)
(31
)
(50
)
Liabilities disposed(1)
(8
)
—

(8
)
Accretion
23

—

23

Revisions in estimated cash flows(2)
41

1

42

Revisions in discount rates(2)
110

—

110

Reversals
—

(4
)
(4
)
Change in foreign exchange rates
(6
)
(2
)
(8
)
Balance, Dec. 31, 2017
437

33

470

(1) Relates to the disposition of the Solomon power station and the sale of the Wintering Hills wind facility.
(2) During 2017, mainly as a result of the OCA (see Note 4(H)), the discount rates used for the Canadian coal and mining operations decommissioning provisions were changed to the use of 5 to 15-year rates. The use of lower, shorter-term discount rates increased the corresponding liabilities. On average, these rates decreased by approximately 1.60 to 2.10 per cent. Additionally, the amount and timing of cash outflows for certain Canadian coal plants and mining operations was also revised, resulting in an increase to the corresponding liabilities.

 
Decommissioning and
restoration

Other

Total

Balance, Dec. 31, 2016
293

50

343

Current portion
27

12

39

Non-current portion
266

38

304

Balance, Dec. 31, 2017
437

33

470

Current portion
40

27

67

Non-current portion
397

6

403