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Risk Management - Financial Instruments Subject to Credit Exposure (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Loan commitments    
Disclosure of credit risk exposure [line items]    
Credit exposure $ 315,670 $ 310,053
Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,495 1,372
Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 360 373
Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 24,056 22,520
Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 2,310 2,436
Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 4,300 3,790
Gross carrying amount | FVOCI | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 205,166 205,777
Gross carrying amount | FVOCI | Debt securities | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 199,178 199,814
Gross carrying amount | FVOCI | Debt securities | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 5,988 5,963
Gross carrying amount | FVOCI | Private placements    
Disclosure of credit risk exposure [line items]    
Credit exposure 48,802 44,952
Gross carrying amount | FVOCI | Private placements | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 42,517 39,366
Gross carrying amount | FVOCI | Private placements | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 6,285 5,586
Gross carrying amount | FVOCI | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 28,792 28,473
Gross carrying amount | FVOCI | Commercial mortgages | AAA    
Disclosure of credit risk exposure [line items]    
Credit exposure 205 279
Gross carrying amount | FVOCI | Commercial mortgages | AA    
Disclosure of credit risk exposure [line items]    
Credit exposure 7,234 6,815
Gross carrying amount | FVOCI | Commercial mortgages | A    
Disclosure of credit risk exposure [line items]    
Credit exposure 14,035 14,197
Gross carrying amount | FVOCI | Commercial mortgages | BBB    
Disclosure of credit risk exposure [line items]    
Credit exposure 6,552 6,497
Gross carrying amount | FVOCI | Commercial mortgages | BB    
Disclosure of credit risk exposure [line items]    
Credit exposure 674 542
Gross carrying amount | FVOCI | Commercial mortgages | B and lower    
Disclosure of credit risk exposure [line items]    
Credit exposure 92 143
Gross carrying amount | FVOCI | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 389 360
Gross carrying amount | FVOCI | Other invested assets | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Gross carrying amount | FVOCI | Other invested assets | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 389 360
Gross carrying amount | Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,496 1,373
Gross carrying amount | Amortized cost | Debt securities | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,496 1,373
Gross carrying amount | Amortized cost | Debt securities | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Gross carrying amount | Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 362 376
Gross carrying amount | Amortized cost | Commercial mortgages | AAA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Gross carrying amount | Amortized cost | Commercial mortgages | AA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Gross carrying amount | Amortized cost | Commercial mortgages | A    
Disclosure of credit risk exposure [line items]    
Credit exposure 240 196
Gross carrying amount | Amortized cost | Commercial mortgages | BBB    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Gross carrying amount | Amortized cost | Commercial mortgages | BB    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Gross carrying amount | Amortized cost | Commercial mortgages | B and lower    
Disclosure of credit risk exposure [line items]    
Credit exposure 122 180
Gross carrying amount | Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 24,062 22,528
Gross carrying amount | Amortized cost | Residential mortgages | Performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 24,021 22,468
Gross carrying amount | Amortized cost | Residential mortgages | Non-performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 41 60
Gross carrying amount | Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 2,313 2,439
Gross carrying amount | Amortized cost | Loans to Bank clients | Performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 2,303 2,431
Gross carrying amount | Amortized cost | Loans to Bank clients | Non-performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 10 8
Gross carrying amount | Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 4,302 3,791
Gross carrying amount | Amortized cost | Other invested assets | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 4,302 3,791
Gross carrying amount | Amortized cost | Other invested assets | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Accumulated impairment | Loan commitments    
Disclosure of credit risk exposure [line items]    
Credit exposure 11 12
Accumulated impairment | FVOCI | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 270 343
Accumulated impairment | FVOCI | Private placements    
Disclosure of credit risk exposure [line items]    
Credit exposure 376 317
Accumulated impairment | FVOCI | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 135 225
Accumulated impairment | FVOCI | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 22 16
Accumulated impairment | Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 1 1
Accumulated impairment | Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 2 3
Accumulated impairment | Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 6 8
Accumulated impairment | Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 3 3
Accumulated impairment | Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 2 1
Stage 1 | Loan commitments    
Disclosure of credit risk exposure [line items]    
Credit exposure 309,080 301,682
Stage 1 | Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,495 1,372
Stage 1 | Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 336 292
Stage 1 | Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 22,867 20,894
Stage 1 | Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 2,264 2,385
Stage 1 | Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 4,300 3,790
Stage 1 | Gross carrying amount | FVOCI | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 203,465 202,929
Stage 1 | Gross carrying amount | FVOCI | Debt securities | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 197,840 197,562
Stage 1 | Gross carrying amount | FVOCI | Debt securities | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 5,625 5,367
Stage 1 | Gross carrying amount | FVOCI | Private placements    
Disclosure of credit risk exposure [line items]    
Credit exposure 46,800 42,932
Stage 1 | Gross carrying amount | FVOCI | Private placements | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 41,796 37,722
Stage 1 | Gross carrying amount | FVOCI | Private placements | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 5,004 5,210
Stage 1 | Gross carrying amount | FVOCI | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 27,164 26,728
Stage 1 | Gross carrying amount | FVOCI | Commercial mortgages | AAA    
Disclosure of credit risk exposure [line items]    
Credit exposure 205 279
Stage 1 | Gross carrying amount | FVOCI | Commercial mortgages | AA    
Disclosure of credit risk exposure [line items]    
Credit exposure 7,234 6,815
Stage 1 | Gross carrying amount | FVOCI | Commercial mortgages | A    
Disclosure of credit risk exposure [line items]    
Credit exposure 14,035 14,111
Stage 1 | Gross carrying amount | FVOCI | Commercial mortgages | BBB    
Disclosure of credit risk exposure [line items]    
Credit exposure 5,679 5,513
Stage 1 | Gross carrying amount | FVOCI | Commercial mortgages | BB    
Disclosure of credit risk exposure [line items]    
Credit exposure 11 10
Stage 1 | Gross carrying amount | FVOCI | Commercial mortgages | B and lower    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 1 | Gross carrying amount | FVOCI | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 389 360
Stage 1 | Gross carrying amount | FVOCI | Other invested assets | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 1 | Gross carrying amount | FVOCI | Other invested assets | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 389 360
Stage 1 | Gross carrying amount | Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,496 1,373
Stage 1 | Gross carrying amount | Amortized cost | Debt securities | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,496 1,373
Stage 1 | Gross carrying amount | Amortized cost | Debt securities | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 1 | Gross carrying amount | Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 337 293
Stage 1 | Gross carrying amount | Amortized cost | Commercial mortgages | AAA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 1 | Gross carrying amount | Amortized cost | Commercial mortgages | AA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 1 | Gross carrying amount | Amortized cost | Commercial mortgages | A    
Disclosure of credit risk exposure [line items]    
Credit exposure 225 148
Stage 1 | Gross carrying amount | Amortized cost | Commercial mortgages | BBB    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 1 | Gross carrying amount | Amortized cost | Commercial mortgages | BB    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 1 | Gross carrying amount | Amortized cost | Commercial mortgages | B and lower    
Disclosure of credit risk exposure [line items]    
Credit exposure 112 145
Stage 1 | Gross carrying amount | Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 22,870 20,898
Stage 1 | Gross carrying amount | Amortized cost | Residential mortgages | Performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 22,870 20,898
Stage 1 | Gross carrying amount | Amortized cost | Residential mortgages | Non-performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 1 | Gross carrying amount | Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 2,265 2,387
Stage 1 | Gross carrying amount | Amortized cost | Loans to Bank clients | Performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 2,265 2,387
Stage 1 | Gross carrying amount | Amortized cost | Loans to Bank clients | Non-performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 1 | Gross carrying amount | Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 4,302 3,791
Stage 1 | Gross carrying amount | Amortized cost | Other invested assets | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 4,302 3,791
Stage 1 | Gross carrying amount | Amortized cost | Other invested assets | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 1 | Accumulated impairment | Loan commitments    
Disclosure of credit risk exposure [line items]    
Credit exposure 9 9
Stage 1 | Accumulated impairment | FVOCI | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 228 283
Stage 1 | Accumulated impairment | FVOCI | Private placements    
Disclosure of credit risk exposure [line items]    
Credit exposure 126 126
Stage 1 | Accumulated impairment | FVOCI | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 41 40
Stage 1 | Accumulated impairment | FVOCI | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 22 16
Stage 1 | Accumulated impairment | Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 1 1
Stage 1 | Accumulated impairment | Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 1 1
Stage 1 | Accumulated impairment | Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 3 4
Stage 1 | Accumulated impairment | Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 1 2
Stage 1 | Accumulated impairment | Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 2 1
Stage 2 | Loan commitments    
Disclosure of credit risk exposure [line items]    
Credit exposure 6,317 8,118
Stage 2 | Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 19 81
Stage 2 | Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,149 1,568
Stage 2 | Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 37 44
Stage 2 | Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | FVOCI | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,701 2,848
Stage 2 | Gross carrying amount | FVOCI | Debt securities | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,338 2,252
Stage 2 | Gross carrying amount | FVOCI | Debt securities | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 363 596
Stage 2 | Gross carrying amount | FVOCI | Private placements    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,854 1,939
Stage 2 | Gross carrying amount | FVOCI | Private placements | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 721 1,644
Stage 2 | Gross carrying amount | FVOCI | Private placements | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,133 295
Stage 2 | Gross carrying amount | FVOCI | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,557 1,638
Stage 2 | Gross carrying amount | FVOCI | Commercial mortgages | AAA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | FVOCI | Commercial mortgages | AA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | FVOCI | Commercial mortgages | A    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 86
Stage 2 | Gross carrying amount | FVOCI | Commercial mortgages | BBB    
Disclosure of credit risk exposure [line items]    
Credit exposure 873 984
Stage 2 | Gross carrying amount | FVOCI | Commercial mortgages | BB    
Disclosure of credit risk exposure [line items]    
Credit exposure 663 532
Stage 2 | Gross carrying amount | FVOCI | Commercial mortgages | B and lower    
Disclosure of credit risk exposure [line items]    
Credit exposure 21 36
Stage 2 | Gross carrying amount | FVOCI | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | FVOCI | Other invested assets | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | FVOCI | Other invested assets | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Debt securities | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Debt securities | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 20 83
Stage 2 | Gross carrying amount | Amortized cost | Commercial mortgages | AAA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Commercial mortgages | AA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Commercial mortgages | A    
Disclosure of credit risk exposure [line items]    
Credit exposure 15 48
Stage 2 | Gross carrying amount | Amortized cost | Commercial mortgages | BBB    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Commercial mortgages | BB    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Commercial mortgages | B and lower    
Disclosure of credit risk exposure [line items]    
Credit exposure 5 35
Stage 2 | Gross carrying amount | Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,151 1,570
Stage 2 | Gross carrying amount | Amortized cost | Residential mortgages | Performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 1,151 1,570
Stage 2 | Gross carrying amount | Amortized cost | Residential mortgages | Non-performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 38 44
Stage 2 | Gross carrying amount | Amortized cost | Loans to Bank clients | Performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 38 44
Stage 2 | Gross carrying amount | Amortized cost | Loans to Bank clients | Non-performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Other invested assets | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Gross carrying amount | Amortized cost | Other invested assets | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Accumulated impairment | Loan commitments    
Disclosure of credit risk exposure [line items]    
Credit exposure 1 1
Stage 2 | Accumulated impairment | FVOCI | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 42 54
Stage 2 | Accumulated impairment | FVOCI | Private placements    
Disclosure of credit risk exposure [line items]    
Credit exposure 127 108
Stage 2 | Accumulated impairment | FVOCI | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 39 42
Stage 2 | Accumulated impairment | FVOCI | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Accumulated impairment | Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 2 | Accumulated impairment | Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 1 2
Stage 2 | Accumulated impairment | Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 2 2
Stage 2 | Accumulated impairment | Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 1 0
Stage 2 | Accumulated impairment | Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Loan commitments    
Disclosure of credit risk exposure [line items]    
Credit exposure 273 253
Stage 3 | Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 5 0
Stage 3 | Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 40 58
Stage 3 | Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 9 7
Stage 3 | Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Debt securities | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Debt securities | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Private placements    
Disclosure of credit risk exposure [line items]    
Credit exposure 148 81
Stage 3 | Gross carrying amount | FVOCI | Private placements | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Private placements | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 148 81
Stage 3 | Gross carrying amount | FVOCI | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 71 107
Stage 3 | Gross carrying amount | FVOCI | Commercial mortgages | AAA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Commercial mortgages | AA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Commercial mortgages | A    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Commercial mortgages | BBB    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Commercial mortgages | BB    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Commercial mortgages | B and lower    
Disclosure of credit risk exposure [line items]    
Credit exposure 71 107
Stage 3 | Gross carrying amount | FVOCI | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Other invested assets | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | FVOCI | Other invested assets | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Debt securities | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Debt securities | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 5 0
Stage 3 | Gross carrying amount | Amortized cost | Commercial mortgages | AAA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Commercial mortgages | AA    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Commercial mortgages | A    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Commercial mortgages | BBB    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Commercial mortgages | BB    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Commercial mortgages | B and lower    
Disclosure of credit risk exposure [line items]    
Credit exposure 5 0
Stage 3 | Gross carrying amount | Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 41 60
Stage 3 | Gross carrying amount | Amortized cost | Residential mortgages | Performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Residential mortgages | Non-performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 41 60
Stage 3 | Gross carrying amount | Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 10 8
Stage 3 | Gross carrying amount | Amortized cost | Loans to Bank clients | Performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Loans to Bank clients | Non-performing    
Disclosure of credit risk exposure [line items]    
Credit exposure 10 8
Stage 3 | Gross carrying amount | Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Other invested assets | Investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Gross carrying amount | Amortized cost | Other invested assets | Non-investment grade    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Accumulated impairment | Loan commitments    
Disclosure of credit risk exposure [line items]    
Credit exposure 1 2
Stage 3 | Accumulated impairment | FVOCI | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 6
Stage 3 | Accumulated impairment | FVOCI | Private placements    
Disclosure of credit risk exposure [line items]    
Credit exposure 123 83
Stage 3 | Accumulated impairment | FVOCI | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 55 143
Stage 3 | Accumulated impairment | FVOCI | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Accumulated impairment | Amortized cost | Debt securities    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Accumulated impairment | Amortized cost | Commercial mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 0 0
Stage 3 | Accumulated impairment | Amortized cost | Residential mortgages    
Disclosure of credit risk exposure [line items]    
Credit exposure 1 2
Stage 3 | Accumulated impairment | Amortized cost | Loans to Bank clients    
Disclosure of credit risk exposure [line items]    
Credit exposure 1 1
Stage 3 | Accumulated impairment | Amortized cost | Other invested assets    
Disclosure of credit risk exposure [line items]    
Credit exposure $ 0 $ 0