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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, 2022
Dec. 31, 2021
Revenue    
Gross premiums $ 44,102 $ 44,344
Premiums ceded to reinsurers (6,249) (5,279)
Net premium income 37,853 39,065
Net investment income (loss) (29,870) 11,624
Other revenue 9,164 11,132
Total revenue 17,147 61,821
Contract benefits and expenses    
Net benefits and claims (9,299) 35,822
Commissions, investment and general expenses 15,905 16,446
Other expenses 1,794 1,428
Total contract benefits and expenses 8,400 53,696
Income (loss) before income taxes 8,747 8,125
Income tax (expense) recovery (1,565) (1,213)
Income (loss) after income taxes 7,182 6,912
Equity in net income (loss) of unconsolidated subsidiaries 0  
Net income 7,182 6,912
Net income (loss) attributed to:    
Non-controlling interests (1) 255
Participating policyholders (111) (448)
Shareholders and other equity holders 7,294 7,105
Net income 7,182 6,912
Consolidation adjustments [Member]    
Revenue    
Gross premiums (863) (1,001)
Premiums ceded to reinsurers 974 995
Net premium income 111 (6)
Net investment income (loss) (1,264) (1,125)
Other revenue 1,048 (548)
Total revenue (105) (1,679)
Contract benefits and expenses    
Net benefits and claims 778 877
Commissions, investment and general expenses (1,034) (1,436)
Other expenses 151 (1,120)
Total contract benefits and expenses (105) (1,679)
Equity in net income (loss) of unconsolidated subsidiaries (10,269) (9,742)
Net income (10,269) (9,742)
Net income (loss) attributed to:    
Participating policyholders   4
Shareholders and other equity holders (10,269) (9,746)
Net income (10,269) (9,742)
MFC (Guarantor) [Member]    
Revenue    
Net investment income (loss) 554 530
Other revenue (36) 33
Total revenue 518 563
Contract benefits and expenses    
Commissions, investment and general expenses 42 12
Other expenses 440 390
Total contract benefits and expenses 482 402
Income (loss) before income taxes 36 161
Income tax (expense) recovery 32 (28)
Income (loss) after income taxes 68 133
Equity in net income (loss) of unconsolidated subsidiaries 7,226 6,972
Net income 7,294 7,105
Net income (loss) attributed to:    
Shareholders and other equity holders 7,294 7,105
Net income 7,294 7,105
JHUSA (Issuer) [Member]    
Revenue    
Gross premiums 7,924 7,782
Premiums ceded to reinsurers (2,561) (3,243)
Net premium income 5,363 4,539
Net investment income (loss) (9,714) 3,779
Other revenue 281 2,042
Total revenue (4,070) 10,360
Contract benefits and expenses    
Net benefits and claims (8,505) 6,478
Commissions, investment and general expenses 3,099 3,451
Other expenses 264 212
Total contract benefits and expenses (5,142) 10,141
Income (loss) before income taxes 1,072 219
Income tax (expense) recovery (23) 115
Income (loss) after income taxes 1,049 334
Equity in net income (loss) of unconsolidated subsidiaries 997 1,218
Net income 2,046 1,552
Net income (loss) attributed to:    
Participating policyholders (236) (4)
Shareholders and other equity holders 2,282 1,556
Net income 2,046 1,552
Other subsidiaries    
Revenue    
Gross premiums 37,041 37,563
Premiums ceded to reinsurers (4,662) (3,031)
Net premium income 32,379 34,532
Net investment income (loss) (19,446) 8,440
Other revenue 7,871 9,605
Total revenue 20,804 52,577
Contract benefits and expenses    
Net benefits and claims (1,572) 28,467
Commissions, investment and general expenses 13,798 14,419
Other expenses 939 1,946
Total contract benefits and expenses 13,165 44,832
Income (loss) before income taxes 7,639 7,745
Income tax (expense) recovery (1,574) (1,300)
Income (loss) after income taxes 6,065 6,445
Equity in net income (loss) of unconsolidated subsidiaries 2,046 1,552
Net income 8,111 7,997
Net income (loss) attributed to:    
Non-controlling interests (1) 255
Participating policyholders 125 (448)
Shareholders and other equity holders 7,987 8,190
Net income $ 8,111 $ 7,997