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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
The majority of these liabilities are discounted at 6.25%. Accretion expense is included in “Depreciation and amortization” on the Consolidated Statements of Income. 
(in millions of Canadian dollars)
2015

2014

Opening balance, January 1
$
23

$
24

Accretion
1

1

Liabilities settled
(1
)
(1
)
Revision to estimated cash flows
(1
)
(1
)
Closing balance, December 31
$
22

$
23