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CHANGES IN ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies, Changes In Accounting Estimates And Errors [Abstract]  
Disclosure of initial application of standards or interpretations
The impacts of adoption of IFRS 16 as at January 1, 2019 are as follows:

As at December 31, 2018

Adjustments

Opening Value January 1, 2019

($ millions)
Assets



Current assets



Trade receivables and other(1)
604

1

605

Non-current assets



Property, plant and equipment(2)
14,730

(18
)
14,712

Right-of-use assets(3)
—

427

427

Advances to related parties and other assets(1)(4)
144

33

177

Liabilities and Equity



Current liabilities



Trade payables and other(4)
870

(7
)
863

Loans and borrowings(5)
480

(8
)
472

Lease liabilities
—

64

64

Non-current liabilities



Loans and borrowings(5)
7,057

(11
)
7,046

Lease liabilities
—

416

416

Deferred tax liabilities
2,774

8

2,782

Other liabilities(4)
239

(41
)
198

Equity



Attributable to shareholders
14,344

22

14,366

(1) 
Includes lessor finance lease receivables.
(2) 
Finance lease assets previously recorded in property, plant and equipment were reclassified to right-of-use assets.
(3) 
Right-of-use assets are recorded at a value equal to the associated lease liability of $480 million, less $33 million for sublease arrangements, less onerous lease liability balance at December 31, 2018 of $20 million.
(4) 
Operating lease payments were previously recognized on a straight-line basis, with the difference between cash payments and expense (income) recorded to a deferred lease asset or deferred lease liability. These deferrals were derecognized on adoption of IFRS 16. In addition, $20 million of onerous lease liabilities were offset against right-of-use assets.
(5) 
Finance leases previously recorded in loans and borrowings were reclassified to lease liabilities.
Reconciliation of lease liability
($ millions)


Lease commitments, disclosed at December 31, 2018
796

Leases not yet commenced
(33
)
Non-lease components
(217
)
Renewal options reasonably certain to be exercised
53

Total undiscounted lease payments
599

Discounting impact(1)
(119
)
Lease liabilities recognized as at January 1, 2019
480

(1) 
Pembina discounted lease payments using the incremental credit-risk adjusted borrowing rate applicable to the contract. The weighted-average rate applied on transition for all lease liabilities was