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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
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenue    
Net premium income CAD 28,210 CAD 27,632
Net investment income (loss) 19,367 14,524
Net other revenue 10,746 11,181
Total revenue 58,323 53,337
Contract benefits and expenses    
Net benefits and claims 39,301 34,134
Commissions, investment and general expenses 15,022 14,459
Other expenses 1,499 1,415
Total contract benefits and expenses 55,822 50,008
Income (loss) before income taxes 2,501 3,329
Income tax (expense) recovery (239) (196)
Income (loss) after income taxes 2,262 3,133
Net income 2,262 3,133
Net income (loss) attributed to:    
Non-controlling interests 194 143
Participating policyholders (36) 61
Shareholders 2,104 2,929
Net income 2,262 3,133
MFC (Guarantor) [Member]    
Revenue    
Net investment income (loss) 178 475
Net other revenue 4 43
Total revenue 182 518
Contract benefits and expenses    
Commissions, investment and general expenses 11 11
Other expenses 404 259
Total contract benefits and expenses 415 270
Income (loss) before income taxes (233) 248
Income tax (expense) recovery 62 28
Income (loss) after income taxes (171) 276
Equity in net income (loss) of unconsolidated subsidiaries 2,275 2,653
Net income 2,104 2,929
Net income (loss) attributed to:    
Shareholders 2,104 2,929
Net income 2,104 2,929
JHUSA (Issuer) [Member]    
Revenue    
Net premium income 11,084 5,021
Net investment income (loss) 7,986 6,191
Net other revenue 2,874 2,569
Total revenue 21,944 13,781
Contract benefits and expenses    
Net benefits and claims 20,803 10,340
Commissions, investment and general expenses 3,208 3,272
Other expenses 194 59
Total contract benefits and expenses 24,205 13,671
Income (loss) before income taxes (2,261) 110
Income tax (expense) recovery 1,134 251
Income (loss) after income taxes (1,127) 361
Equity in net income (loss) of unconsolidated subsidiaries 628 211
Net income (499) 572
Net income (loss) attributed to:    
Participating policyholders (10) (48)
Shareholders (489) 620
Net income (499) 572
Other subsidiaries    
Revenue    
Net premium income 17,130 22,611
Net investment income (loss) 11,947 9,092
Net other revenue 10,912 11,108
Total revenue 39,989 42,811
Contract benefits and expenses    
Net benefits and claims 19,179 24,748
Commissions, investment and general expenses 13,900 13,016
Other expenses 1,915 2,076
Total contract benefits and expenses 34,994 39,840
Income (loss) before income taxes 4,995 2,971
Income tax (expense) recovery (1,435) (475)
Income (loss) after income taxes 3,560 2,496
Equity in net income (loss) of unconsolidated subsidiaries (486) 572
Net income 3,074 3,068
Net income (loss) attributed to:    
Non-controlling interests 194 143
Participating policyholders (36) 61
Shareholders 2,916 2,864
Net income 3,074 3,068
Consolidation adjustments [Member]    
Revenue    
Net premium income (4)  
Net investment income (loss) (744) (1,234)
Net other revenue (3,044) (2,539)
Total revenue (3,792) (3,773)
Contract benefits and expenses    
Net benefits and claims (681) (954)
Commissions, investment and general expenses (2,097) (1,840)
Other expenses (1,014) (979)
Total contract benefits and expenses (3,792) (3,773)
Equity in net income (loss) of unconsolidated subsidiaries (2,417) (3,436)
Net income (2,417) (3,436)
Net income (loss) attributed to:    
Participating policyholders 10 48
Shareholders (2,427) (3,484)
Net income CAD (2,417) CAD (3,436)