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Commercial Mortgage Loans By Year of Origination and Credit Quality Indicator (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost $ 6,692 $ 6,829
Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 6,692 6,829
0% - 50%    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 2,280 2,368
0% - 50% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 2,280  
51% - 60%    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 1,452 1,393
51% - 60% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 1,452  
61% - 75%    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 2,910 3,018
61% - 75% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 2,910  
76% - 100%    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 50 50
76% - 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 50  
Greater than 100%    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0 0
Greater than 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
Less than 1.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 253 265
1.00 - 1.25 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 255 263
1.26 - 1.50 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 1,223 1,196
1.51 - 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 2,569 2,611
Greater than 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 2,392 $ 2,494
2024 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 129  
2024 | 0% - 50% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 29  
2024 | 51% - 60% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 6  
2024 | 61% - 75% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 94  
2024 | 76% - 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2024 | Greater than 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2024 | Less than 1.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2024 | 1.00 - 1.25 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 3  
2024 | 1.26 - 1.50 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 59  
2024 | 1.51 - 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 42  
2024 | Greater than 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 25  
2023 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 269  
2023 | 0% - 50% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 20  
2023 | 51% - 60% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 28  
2023 | 61% - 75% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 221  
2023 | 76% - 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2023 | Greater than 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2023 | Less than 1.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2023 | 1.00 - 1.25 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 14  
2023 | 1.26 - 1.50 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 171  
2023 | 1.51 - 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 65  
2023 | Greater than 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 19  
2022 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 919  
2022 | 0% - 50% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 74  
2022 | 51% - 60% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 107  
2022 | 61% - 75% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 738  
2022 | 76% - 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2022 | Greater than 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2022 | Less than 1.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 17  
2022 | 1.00 - 1.25 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 37  
2022 | 1.26 - 1.50 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 220  
2022 | 1.51 - 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 391  
2022 | Greater than 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 254  
2021 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 894  
2021 | 0% - 50% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 85  
2021 | 51% - 60% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 239  
2021 | 61% - 75% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 570  
2021 | 76% - 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2021 | Greater than 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2021 | Less than 1.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 4  
2021 | 1.00 - 1.25 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 9  
2021 | 1.26 - 1.50 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 102  
2021 | 1.51 - 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 416  
2021 | Greater than 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 363  
2020 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 470  
2020 | 0% - 50% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 114  
2020 | 51% - 60% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 105  
2020 | 61% - 75% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 247  
2020 | 76% - 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 4  
2020 | Greater than 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2020 | Less than 1.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 17  
2020 | 1.00 - 1.25 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 16  
2020 | 1.26 - 1.50 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 66  
2020 | 1.51 - 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 201  
2020 | Greater than 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 170  
2019 and prior | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 4,011  
2019 and prior | 0% - 50% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 1,958  
2019 and prior | 51% - 60% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 967  
2019 and prior | 61% - 75% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 1,040  
2019 and prior | 76% - 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 46  
2019 and prior | Greater than 100% | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 0  
2019 and prior | Less than 1.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 215  
2019 and prior | 1.00 - 1.25 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 176  
2019 and prior | 1.26 - 1.50 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 605  
2019 and prior | 1.51 - 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost 1,454  
2019 and prior | Greater than 2.00 | Fixed Rate Commercial Mortgage Loans    
Disclosure Of Commercial Mortgage Loans By Year Of Origination And Credit Quality Indicator [Line Items]    
Commercial mortgage loans, amortized cost $ 1,561