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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, 2018
Dec. 31, 2017
Revenue    
Gross premiums $ 39,150 $ 36,361
Premiums ceded to reinsurers (15,138) (8,151)
Net premium income 24,012 28,210
Net investment income (loss) 4,532 19,367
Net other revenue 10,428 10,746
Total revenue 38,972 58,323
Contract benefits and expenses    
Net benefits and claims 15,934 39,301
Commissions, investment and general expenses 15,838 15,022
Other expenses 1,681 1,499
Total contract benefits and expenses 33,453 55,822
Income (loss) before income taxes 5,519 2,501
Income tax (expense) recovery (632) (239)
Income (loss) after income taxes 4,887 2,262
Net income 4,887 2,262
Net income (loss) attributed to:    
Non-controlling interests 214 194
Participating policyholders (127) (36)
Shareholders 4,800 2,104
Net income 4,887 2,262
Consolidation adjustments [Member]    
Revenue    
Gross premiums (1,116) 4,905
Premiums ceded to reinsurers 1,116 (4,909)
Net premium income   (4)
Net investment income (loss) (946) (744)
Net other revenue (1,189) (2,996)
Total revenue (2,135) (3,744)
Contract benefits and expenses    
Net benefits and claims 475 (681)
Commissions, investment and general expenses (1,660) (2,049)
Other expenses (950) (1,014)
Total contract benefits and expenses (2,135) (3,744)
Equity in net income (loss) of unconsolidated subsidiaries (8,154) (2,417)
Net income (8,154) (2,417)
Net income (loss) attributed to:    
Participating policyholders 10 10
Shareholders (8,164) (2,427)
Net income (8,154) (2,417)
MFC (Guarantor) [Member]    
Revenue    
Net investment income (loss) 445 178
Net other revenue (2) 4
Total revenue 443 182
Contract benefits and expenses    
Commissions, investment and general expenses 19 11
Other expenses 380 404
Total contract benefits and expenses 399 415
Income (loss) before income taxes 44 (233)
Income tax (expense) recovery (11) 62
Income (loss) after income taxes 33 (171)
Equity in net income (loss) of unconsolidated subsidiaries 4,767 2,275
Net income 4,800 2,104
Net income (loss) attributed to:    
Shareholders 4,800 2,104
Net income 4,800 2,104
JHUSA (Issuer) [Member]    
Revenue    
Gross premiums 8,452 8,561
Premiums ceded to reinsurers (14,149) 2,523
Net premium income (5,697) 11,084
Net investment income (loss) 907 7,986
Net other revenue 1,799 2,874
Total revenue (2,991) 21,944
Contract benefits and expenses    
Net benefits and claims (7,403) 20,803
Commissions, investment and general expenses 3,427 3,208
Other expenses 233 194
Total contract benefits and expenses (3,743) 24,205
Income (loss) before income taxes 752 (2,261)
Income tax (expense) recovery 223 1,134
Income (loss) after income taxes 975 (1,127)
Equity in net income (loss) of unconsolidated subsidiaries 1,206 628
Net income 2,181 (499)
Net income (loss) attributed to:    
Participating policyholders (10) (10)
Shareholders 2,191 (489)
Net income 2,181 (499)
Other subsidiaries    
Revenue    
Gross premiums 31,814 22,895
Premiums ceded to reinsurers (2,105) (5,765)
Net premium income 29,709 17,130
Net investment income (loss) 4,126 11,947
Net other revenue 9,820 10,864
Total revenue 43,655 39,941
Contract benefits and expenses    
Net benefits and claims 22,862 19,179
Commissions, investment and general expenses 14,052 13,852
Other expenses 2,018 1,915
Total contract benefits and expenses 38,932 34,946
Income (loss) before income taxes 4,723 4,995
Income tax (expense) recovery (844) (1,435)
Income (loss) after income taxes 3,879 3,560
Equity in net income (loss) of unconsolidated subsidiaries 2,181 (486)
Net income 6,060 3,074
Net income (loss) attributed to:    
Non-controlling interests 214 194
Participating policyholders (127) (36)
Shareholders 5,973 2,916
Net income $ 6,060 $ 3,074