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TRADE RECEIVABLES AND OTHER
 12 Months Ended
Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract]  
TRADE RECEIVABLES AND OTHER
TRADE RECEIVABLES AND OTHER
As at December 31
 
 
($ millions)
2019

2018

Trade receivables from customers
575

501

Other receivables
92

88

Prepayments
25

16

Impairment loss allowance
—

(1
)
Total trade receivables and other
692

604