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Decommissioning and Other Provisions (Tables)
 12 Months Ended
Dec. 31, 2018
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, 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

Liabilities incurred
5

17

22

Liabilities settled
(31
)
(10
)
(41
)
Accretion
24

—

24

Acquisition of liabilities (Big Level)
 
8

8

Revisions in estimated cash flows
2

3

5

Revisions in discount rates
(37
)
—

(37
)
Reversals
—

(5
)
(5
)
Change in foreign exchange rates
7

3

10

Balance, Dec. 31, 2018
407

49

456

(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(O)), 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, 2017
437

33

470

Current portion
40

27

67

Non-current portion
397

6

403

Balance, Dec. 31, 2018
407

49

456

Current portion
35

35

70

Non-current portion
372

14

386