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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

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