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Information Provided in Connection with Investments in Deferred Annuity Contracts and SignatureNotes Issued or Assumed by John Hancock Life Insurance Company (U.S.A.) - Summary of Condensed Consolidated Statement of Income (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Insurance service result    
Insurance revenue $ 23,972 $ 23,118
Insurance service expenses (19,382) (19,335)
Net expenses from reinsurance contracts held (613) (623)
Total insurance service result 3,977 3,160
Investment result    
Net investment income (loss) 18,021 337
Insurance/reinsurance finance income (expenses) (14,628) (6,307)
Other investment result (435) (399)
Total investment result 2,958 (6,369)
Other revenue 6,746 6,186
Other expenses (5,675) (5,064)
Interest expenses (1,554) (1,051)
Net income (loss) before income taxes 6,452 (3,138)
Income tax (expenses) recoveries (845) 1,159
Net income (loss) after income taxes 5,607 (1,979)
Equity in net income (loss) of unconsolidated subsidiaries 0  
Net income (loss) 5,607 (1,979)
Net income (loss) attributed to:    
Non-controlling interests 144 121
Participating policyholders 360 (167)
Shareholders and other equity holders 5,103 (1,933)
Net income 5,607 (1,979)
Consolidation adjustments [Member]    
Insurance service result    
Insurance revenue (1,640) (1,588)
Insurance service expenses 1,741 3,734
Net expenses from reinsurance contracts held (123) (334)
Total insurance service result (22) 1,812
Investment result    
Net investment income (loss) (1,028) (945)
Insurance/reinsurance finance income (expenses) 88 (1,606)
Other investment result (103) (9)
Total investment result (1,043) (2,560)
Other revenue (442) (464)
Other expenses 268 274
Interest expenses 1,239 938
Net income (loss) before income taxes 0  
Income tax (expenses) recoveries 0  
Net income (loss) after income taxes 0  
Equity in net income (loss) of unconsolidated subsidiaries (6,552) 2,110
Net income (loss) (6,552) 2,110
Net income (loss) attributed to:    
Non-controlling interests 0  
Participating policyholders 74 75
Shareholders and other equity holders (6,626) 2,035
Net income (6,552) 2,110
MFC (Guarantor) [Member]    
Insurance service result    
Insurance revenue 0  
Insurance service expenses 0  
Net expenses from reinsurance contracts held 0  
Total insurance service result 0  
Investment result    
Net investment income (loss) 638 554
Insurance/reinsurance finance income (expenses) 0  
Other investment result 0  
Total investment result 638 554
Other revenue 14 (36)
Other expenses (55) (42)
Interest expenses (433) (439)
Net income (loss) before income taxes 164 37
Income tax (expenses) recoveries 7 32
Net income (loss) after income taxes 171 69
Equity in net income (loss) of unconsolidated subsidiaries 4,932 (2,002)
Net income (loss) 5,103 (1,933)
Net income (loss) attributed to:    
Non-controlling interests 0  
Participating policyholders 0  
Shareholders and other equity holders 5,103 (1,933)
Net income 5,103 (1,933)
JHUSA (Issuer) [Member]    
Insurance service result    
Insurance revenue 9,858 9,946
Insurance service expenses (8,928) (10,652)
Net expenses from reinsurance contracts held (315) (570)
Total insurance service result 615 (1,276)
Investment result    
Net investment income (loss) 4,232 (53)
Insurance/reinsurance finance income (expenses) (4,723) (325)
Other investment result 100 36
Total investment result (391) (342)
Other revenue 790 505
Other expenses (1,112) (841)
Interest expenses (79) (54)
Net income (loss) before income taxes (177) (2,008)
Income tax (expenses) recoveries 175 624
Net income (loss) after income taxes (2) (1,384)
Equity in net income (loss) of unconsolidated subsidiaries 811 638
Net income (loss) 809 (746)
Net income (loss) attributed to:    
Non-controlling interests 0  
Participating policyholders (74) (530)
Shareholders and other equity holders 883 (216)
Net income 809 (746)
Other subsidiaries [Member]    
Insurance service result    
Insurance revenue 15,754 14,760
Insurance service expenses (12,195) (12,417)
Net expenses from reinsurance contracts held (175) 281
Total insurance service result 3,384 2,624
Investment result    
Net investment income (loss) 14,179 781
Insurance/reinsurance finance income (expenses) (9,993) (4,376)
Other investment result (432) (426)
Total investment result 3,754 (4,021)
Other revenue 6,384 6,181
Other expenses (4,776) (4,455)
Interest expenses (2,281) (1,496)
Net income (loss) before income taxes 6,465 (1,167)
Income tax (expenses) recoveries (1,027) 503
Net income (loss) after income taxes 5,438 (664)
Equity in net income (loss) of unconsolidated subsidiaries 809 (746)
Net income (loss) 6,247 (1,410)
Net income (loss) attributed to:    
Non-controlling interests 144 121
Participating policyholders 360 288
Shareholders and other equity holders 5,743 (1,819)
Net income $ 6,247 $ (1,410)