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Invested Assets and Investment Income - Schedule of Carrying Values and Fair Values of Invested Assets (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | $ 185,594 | $ 174,000
Private placements | 35,754 | 32,132
Other invested assets | 27,543 | 24,483
Change in the fair value of these invested assets | (460) | 832
Invested assets | 353,664 | 334,222
Less than 1 year [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | 870 | 1,768
Less than 90 days [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | 40 | 161
Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Private placements | 36,103 | 34,581
Change in the fair value of these invested assets | 21 |
Invested assets | 356,217 | 339,488
Alternative long-duration assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets | 23,438 | 20,730
Alternative long-duration assets [Member] | Private equity [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 6,769 | 4,959
Alternative long-duration assets [Member] | Power and infrastructure [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 7,970 | 7,355
Alternative long-duration assets [Member] | Oil and gas [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 3,416 | 2,813
Alternative long-duration assets [Member] | Timber and agriculture [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 4,493 | 5,033
Alternative long-duration assets [Member] | Other invested assets [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value | 791 | 570
Alternative long-duration assets [Member] | Hydroelectric Power [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Total carrying value |  | 426
Alternative long-duration assets [Member] | Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets | 24,211 | 21,053
Cash and short-term securities [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Short-term securities with maturities of less than one year | 2,530 | 2,737
Cash equivalents | 8,713 | 9,131
Cash | 4,972 | 4,097
Other [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets leveraged leases | 3,575 | 3,273
SPPI qualifying [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets | 600 |
SPPI non qualifying [member] | Fair value [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Debt securities | 105 |
Private placements | 230 |
Other invested assets | 465 |
Accumulated depreciation and amortisation [Member] | Real estate own use property [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Accumulated depreciation of own use property | 391 | 389
John Hancock Infrastructure Master Fund LP [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Invested assets | $ 1,422 |
John Hancock Infrastructure Master Fund LP [member] | Top of range [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Partnership voting rights | 1.00% |
Manulife Us Real Estate Investment Trust [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Invested assets | $ 510 | $ 395
Partnership voting rights | 8.50% | 9.50%
Other joint ventures [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Invested assets | $ 1,314 |
Hancock Us Real Estate Fund Lp [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Invested assets |  | $ 619
Partnership voting rights |  | 11.70%

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