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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 Financial Position (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets |  |  |
Invested assets | $ 410,977 | $ 378,527 |
Reinsurance assets | 45,836 | 41,446 |
Other assets | 56,100 | 46,049 |
Segregated funds net assets | 367,436 | 343,108 |
Total assets | 880,349 | 809,130 |
Liabilities and Equity |  |  |
Insurance contract liabilities | 385,554 | 351,161 | $ 328,654
Investment contract liabilities | 3,288 | 3,104 |
Other liabilities | 57,072 | 49,988 |
Long-term debt | 6,164 | 4,543 |
Capital instruments | 7,829 | 7,120 |
Segregated funds net liabilities | 367,436 | 343,108 |
Shareholders' equity | 52,335 | 49,138 |
Participating policyholders' equity | (784) | (243) |
Non-controlling interests | 1,455 | 1,211 |
Total liabilities and equity | 880,349 | 809,130 |
MFC (Guarantor) [Member] |  |  |
Assets |  |  |
Invested assets | 47 | 21 |
Investments in unconsolidated subsidiaries | 64,209 | 57,068 |
Other assets | 210 | 406 |
Segregated funds net assets | 0 |  |
Total assets | 64,466 | 57,495 |
Liabilities and Equity |  |  |
Other liabilities | 718 | 537 |
Long-term debt | 6,164 | 4,543 |
Capital instruments | 5,249 | 3,277 |
Shareholders' equity | 52,335 | 49,138 |
Total liabilities and equity | 64,466 | 57,495 |
JHUSA (Issuer) [Member] |  |  |
Assets |  |  |
Invested assets | 112,735 | 107,746 |
Investments in unconsolidated subsidiaries | 8,078 | 7,467 |
Reinsurance assets | 65,731 | 61,310 |
Other assets | 25,489 | 20,859 |
Segregated funds net assets | 191,955 | 181,982 |
Total assets | 403,988 | 379,364 |
Liabilities and Equity |  |  |
Insurance contract liabilities | 167,453 | 157,398 |
Investment contract liabilities | 1,208 | 1,091 |
Other liabilities | 25,594 | 21,311 |
Capital instruments | 584 | 599 |
Segregated funds net liabilities | 191,955 | 181,982 |
Shareholders' equity | 17,194 | 16,983 |
Total liabilities and equity | 403,988 | 379,364 |
Other subsidiaries |  |  |
Assets |  |  |
Invested assets | 298,524 | 271,100 |
Investments in unconsolidated subsidiaries | 17,194 | 16,983 |
Reinsurance assets | 11,172 | 10,080 |
Other assets | 52,648 | 45,111 |
Segregated funds net assets | 178,224 | 162,845 |
Total assets | 557,762 | 506,119 |
Liabilities and Equity |  |  |
Insurance contract liabilities | 249,909 | 224,378 |
Investment contract liabilities | 2,081 | 2,014 |
Other liabilities | 52,761 | 48,226 |
Capital instruments | 1,996 | 3,244 |
Segregated funds net liabilities | 178,224 | 162,845 |
Shareholders' equity | 72,120 | 64,444 |
Participating policyholders' equity | (784) | (243) |
Non-controlling interests | 1,455 | 1,211 |
Total liabilities and equity | 557,762 | 506,119 |
Consolidation adjustments [Member] |  |  |
Assets |  |  |
Invested assets | (329) | (340) |
Investments in unconsolidated subsidiaries | (89,481) | (81,518) |
Reinsurance assets | (31,067) | (29,944) |
Other assets | (22,247) | (20,327) |
Segregated funds net assets | (2,743) | (1,719) |
Total assets | (145,867) | (133,848) |
Liabilities and Equity |  |  |
Insurance contract liabilities | (31,808) | (30,615) |
Investment contract liabilities | (1) | (1) |
Other liabilities | (22,001) | (20,086) |
Segregated funds net liabilities | (2,743) | (1,719) |
Shareholders' equity | (89,314) | (81,427) |
Total liabilities and equity | $ (145,867) | $ (133,848) |

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