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Stock-Based Compensation Plans - Summary of Stock Option Activity and Related Information (Detail) shares in Thousands | 12 Months Ended
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Dec. 31, 2020 shares $ / shares
NSRs [Member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Number of Share Options Outstanding, Beginning of Year | 31,528
Number of Share Options, Granted | 5,783
Number of Share Options, Exercised | (42)
Number of Share Options, Forfeited | (416)
Number of Share Options, Expired | (6,256)
Number of Share Options Outstanding, End of Year | 30,597
Weighted Average Exercise Price, Outstanding, Beginning of Year | $ / shares | $ 22.61
Weighted Average Exercise Price, Granted | $ / shares | 11.73
Weighted Average Exercise Price, Exercised | $ / shares | 9.48
Weighted Average Exercise Price, Forfeited | $ / shares | 23.52
Weighted Average Exercise Price, Expired | $ / shares | 32.60
Weighted Average Exercise Price, Outstanding, End of Year | $ / shares | $ 18.52
PSUs [Member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Number of Share Units, Outstanding, Beginning of Year | 6,912
Number of Share Units, Granted | 3,846
Number of Share Units, Vested and Paid Out | (1,223)
Number of Share Units, Cancelled | (449)
Number of Share Units, Units in Lieu of Dividends | 198
Number of Share Units, Outstanding, End of Year | 9,284
RSUs [Member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Number of Share Units, Outstanding, Beginning of Year | 8,372
Number of Share Units, Granted | 2,686
Number of Share Units, Vested and Paid Out | (2,606)
Number of Share Units, Cancelled | (234)
Number of Share Units, Units in Lieu of Dividends | 212
Number of Share Units, Outstanding, End of Year | 8,430
DSUs [Member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Number of Share Units, Outstanding, Beginning of Year | 1,237
Number of Share Units, Granted | 30
Number of Share Units, Units in Lieu of Dividends | 33
Number of Share Units, Redeemed | (255)
Number of Share Units, Outstanding, End of Year | 1,333
DSUs [Member] | Director [Member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Number of Share Units, Granted | 288

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