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Common Share Activities (Detail) (CAD)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 228 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2014
Class of Stock [Line Items]      
Common stock beginning balance, shares 847,599,000us-gaap_CommonStockSharesOutstanding 847,599,000us-gaap_CommonStockSharesOutstanding  
Issued under employee share-based awards 2,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 2,776,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Purchases at stated value, shares (2,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares (2,776,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares (906,543,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Common stock, ending balance, shares 847,599,000us-gaap_CommonStockSharesOutstanding 847,599,000us-gaap_CommonStockSharesOutstanding 847,599,000us-gaap_CommonStockSharesOutstanding
Common stock beginning balance, value 1,566us-gaap_CommonStockValue [1] 1,528us-gaap_CommonStockValue  
Issued under employee share-based awards, value   43us-gaap_ProceedsFromStockOptionsExercised  
Purchases at stated value, value     (15,708)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Common stock, ending balance, value 1,566us-gaap_CommonStockValue [1] 1,566us-gaap_CommonStockValue 1,566us-gaap_CommonStockValue [1]
Common Stock      
Class of Stock [Line Items]      
Purchases at stated value, value   (5)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		  
[1] Number of common shares outstanding was 848 million (2013 - 848 million), (note 10).