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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, 2020 | Dec. 31, 2019
Revenue |  |
Gross premiums | $ 41,408 | $ 41,059
Premiums ceded to reinsurers | (8,491) | (5,481)
Net premium income | 32,917 | 35,578
Net investment income (loss) | 35,400 | 33,593
Net other revenue | 10,591 | 10,399
Total revenue | 78,908 | 79,570
Contract benefits and expenses |  |
Net benefits and claims | 55,235 | 55,915
Commissions, investment and general expenses | 15,340 | 15,727
Other expenses | 1,562 | 1,708
Total contract benefits and expenses | 72,137 | 73,350
Income (loss) before income taxes | 6,771 | 6,220
Income tax expense (note 16) | (1,195) | (718)
Income (loss) after income taxes | 5,576 | 5,502
Equity in net income (loss) of unconsolidated subsidiaries | 0 |
Net income | 5,576 | 5,502
Net income (loss) attributed to: |  |
Non-controlling interests | 250 | 233
Participating policyholders | (545) | (333)
Shareholders | 5,871 | 5,602
Net income | 5,576 | 5,502
Consolidation adjustments [Member] |  |
Revenue |  |
Gross premiums | (1,108) | (1,160)
Premiums ceded to reinsurers | 1,108 | 1,160
Net investment income (loss) | (1,073) | (998)
Net other revenue | (5,167) | (3,930)
Total revenue | (6,240) | (4,928)
Contract benefits and expenses |  |
Net benefits and claims | (3,862) | (2,438)
Commissions, investment and general expenses | (1,396) | (1,530)
Other expenses | 982 | 960
Total contract benefits and expenses | (6,240) | (4,928)
Equity in net income (loss) of unconsolidated subsidiaries | (8,908) | (6,925)
Net income | (8,908) | (6,925)
Net income (loss) attributed to: |  |
Participating policyholders |  | (2)
Shareholders | (8,908) | (6,923)
Net income | (8,908) | (6,925)
MFC (Guarantor) [Member] |  |
Revenue |  |
Net investment income (loss) | 542 | 355
Net other revenue | 5 | 16
Total revenue | 547 | 371
Contract benefits and expenses |  |
Commissions, investment and general expenses | 17 | 20
Other expenses | 434 | 421
Total contract benefits and expenses | 451 | 441
Income (loss) before income taxes | 96 | (70)
Income tax expense (note 16) | (26) | 18
Income (loss) after income taxes | 70 | (52)
Equity in net income (loss) of unconsolidated subsidiaries | 5,801 | 5,654
Net income | 5,871 | 5,602
Net income (loss) attributed to: |  |
Shareholders | 5,871 | 5,602
Net income | 5,871 | 5,602
JHUSA (Issuer) [Member] |  |
Revenue |  |
Gross premiums | 8,057 | 8,599
Premiums ceded to reinsurers | (6,585) | (3,575)
Net premium income | 1,472 | 5,024
Net investment income (loss) | 14,204 | 12,128
Net other revenue | 2,869 | 2,866
Total revenue | 18,545 | 20,018
Contract benefits and expenses |  |
Net benefits and claims | 14,804 | 17,133
Commissions, investment and general expenses | 3,146 | 3,299
Other expenses | 230 | 206
Total contract benefits and expenses | 18,180 | 20,638
Income (loss) before income taxes | 365 | (620)
Income tax expense (note 16) | 54 | 347
Income (loss) after income taxes | 419 | (273)
Equity in net income (loss) of unconsolidated subsidiaries | 1,344 | 772
Net income | 1,763 | 499
Net income (loss) attributed to: |  |
Participating policyholders |  | 2
Shareholders | 1,763 | 497
Net income | 1,763 | 499
Other subsidiaries |  |
Revenue |  |
Gross premiums | 34,459 | 33,620
Premiums ceded to reinsurers | (3,014) | (3,066)
Net premium income | 31,445 | 30,554
Net investment income (loss) | 21,727 | 22,108
Net other revenue | 12,884 | 11,447
Total revenue | 66,056 | 64,109
Contract benefits and expenses |  |
Net benefits and claims | 44,293 | 41,220
Commissions, investment and general expenses | 13,573 | 13,938
Other expenses | 1,880 | 2,041
Total contract benefits and expenses | 59,746 | 57,199
Income (loss) before income taxes | 6,310 | 6,910
Income tax expense (note 16) | (1,223) | (1,083)
Income (loss) after income taxes | 5,087 | 5,827
Equity in net income (loss) of unconsolidated subsidiaries | 1,763 | 499
Net income | 6,850 | 6,326
Net income (loss) attributed to: |  |
Non-controlling interests | 250 | 233
Participating policyholders | (545) | (333)
Shareholders | 7,145 | 6,426
Net income | $ 6,850 | $ 6,326

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