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Share Capital - Outstanding Common Shares (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of number of shares outstanding [abstract] |  |  |
Balance – beginning of year | $ 31,974 | $ 31,653 |
Issued upon exercise of stock options (in shares) | 10,871,000 | 9,975,000 |
Purchase of common shares under Normal Course Issuer Bid (In shares) | (25,900,000) |  |
Purchase of common shares under Normal Course Issuer Bid | $ (941) |  |
Balance – end of year | 34,991 | $ 31,974 | $ 31,653
Share capital |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Balance – beginning of year | 9,323 | 9,109 | 4,671
Issued upon exercise of stock options | 360 | 332 | 466
Previously recognized liability on stock options exercised for common shares | 53 | 120 | 154
Purchase of common shares under Normal Course Issuer Bid | (203) | (238) | 0
Balance – end of year | $ 9,533 | $ 9,323 | $ 9,109
Ordinary shares | Share capital |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Balance - beginning of year (in shares) | 1,201,886,000 | 1,222,769,000 |
Balance – beginning of year | $ 9,323 |  |
Issued upon exercise of stock options (in shares) | 10,871,000 | 9,975,000 |
Issued upon exercise of stock options | $ 360 | $ 332 |
Previously recognized liability on stock options exercised for common shares | $ 53 | $ 120 |
Purchase of common shares under Normal Course Issuer Bid (In shares) | (25,900,000) | (30,858,000) |
Purchase of common shares under Normal Course Issuer Bid | $ (203) | $ (238) |
Balance - end of year (in shares) | 1,186,857,000 | 1,201,886,000 | 1,222,769,000
Balance – end of year | $ 9,533 | $ 9,323 |

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