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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, 2021
Dec. 31, 2020
Revenue    
Gross premiums $ 44,344 $ 41,408
Premiums ceded to reinsurers (5,279) (8,491)
Net premium income 39,065 32,917
Net investment income (loss) 11,624 35,400
Other revenue 11,132 10,591
Total revenue 61,821 78,908
Contract benefits and expenses    
Net benefits and claims 35,822 55,235
Commissions, investment and general expenses 16,446 15,340
Other expenses 1,428 1,562
Total contract benefits and expenses 53,696 72,137
Income (loss) before income taxes 8,125 6,771
Income tax (expense) recovery (1,213) (1,195)
Income (loss) after income taxes 6,912 5,576
Net income 6,912 5,576
Net income (loss) attributed to:    
Non-controlling interests 255 250
Participating policyholders (448) (545)
Shareholders and other equity holders 7,105 5,871
Net income 6,912 5,576
Consolidation adjustments [Member]    
Revenue    
Gross premiums (1,001) (1,108)
Premiums ceded to reinsurers 995 1,108
Net premium income (6)  
Net investment income (loss) (1,125) (1,073)
Other revenue (548) (5,167)
Total revenue (1,679) (6,240)
Contract benefits and expenses    
Net benefits and claims 877 (3,862)
Commissions, investment and general expenses (1,436) (1,396)
Other expenses 1,120 982
Total contract benefits and expenses (1,679) (6,240)
Equity in net income (loss) of unconsolidated subsidiaries (9,742) (8,908)
Net income (9,742) (8,908)
Net income (loss) attributed to:    
Participating policyholders 4  
Shareholders and other equity holders (9,746) (8,908)
Net income (9,742) (8,908)
MFC (Guarantor) [Member]    
Revenue    
Net investment income (loss) 530 542
Other revenue 33 5
Total revenue 563 547
Contract benefits and expenses    
Commissions, investment and general expenses 12 17
Other expenses 390 434
Total contract benefits and expenses 402 451
Income (loss) before income taxes 161 96
Income tax (expense) recovery (28) (26)
Income (loss) after income taxes 133 70
Equity in net income (loss) of unconsolidated subsidiaries 6,972 5,801
Net income 7,105 5,871
Net income (loss) attributed to:    
Shareholders and other equity holders 7,105 5,871
Net income 7,105 5,871
JHUSA (Issuer) [Member]    
Revenue    
Gross premiums 7,782 8,057
Premiums ceded to reinsurers (3,243) (6,585)
Net premium income 4,539 1,472
Net investment income (loss) 3,779 14,204
Other revenue 2,042 2,869
Total revenue 10,360 18,545
Contract benefits and expenses    
Net benefits and claims 6,478 14,804
Commissions, investment and general expenses 3,451 3,146
Other expenses 212 230
Total contract benefits and expenses 10,141 18,180
Income (loss) before income taxes 219 365
Income tax (expense) recovery 115 54
Income (loss) after income taxes 334 419
Equity in net income (loss) of unconsolidated subsidiaries 1,218 1,344
Net income 1,552 1,763
Net income (loss) attributed to:    
Participating policyholders (4)  
Shareholders and other equity holders 1,556 1,763
Net income 1,552 1,763
Other subsidiaries    
Revenue    
Gross premiums 37,563 34,459
Premiums ceded to reinsurers (3,031) (3,014)
Net premium income 34,532 31,445
Net investment income (loss) 8,440 21,727
Other revenue 9,605 12,884
Total revenue 52,577 66,056
Contract benefits and expenses    
Net benefits and claims 28,467 44,293
Commissions, investment and general expenses 14,419 13,573
Other expenses 1,946 1,880
Total contract benefits and expenses 44,832 59,746
Income (loss) before income taxes 7,745 6,310
Income tax (expense) recovery (1,300) (1,223)
Income (loss) after income taxes 6,445 5,087
Equity in net income (loss) of unconsolidated subsidiaries 1,552 1,763
Net income 7,997 6,850
Net income (loss) attributed to:    
Non-controlling interests 255 250
Participating policyholders (448) (545)
Shareholders and other equity holders 8,190 7,145
Net income $ 7,997 $ 6,850