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Commitments and Contingencies - Summary of Condensed Consolidated Statements of Income Information for MFC and MFLP (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Condensed Income Statements, Captions [Line Items] |  |
Total revenue | $ 78,908 | $ 79,570
Net income (loss) attributed to shareholders | 5,871 | 5,602
MFC [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Total revenue | 547 | 371
Net income (loss) attributed to shareholders | 5,871 | 5,602
MLI consolidated [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Total revenue | 78,929 | 79,711
Net income (loss) attributed to shareholders | 6,179 | 5,963
Other subsidiaries of MFC on a combined basis [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Total revenue | 520 | 417
Net income (loss) attributed to shareholders | (500) | (401)
Consolidating adjustments [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Total revenue | (1,088) | (929)
Net income (loss) attributed to shareholders | (5,679) | (5,562)
Manulife Finance (Delaware), L.P.[Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Total revenue | 32 | 32
Net income (loss) attributed to shareholders | $ (1) | $ (1)

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