Lending Activities - Credit quality of commercial mortgages (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 48,544	$ 47,565
Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	702	2,447
2023	2,426	7,159
2022	7,307	3,275
2021	3,407	1,564
2020	1,585	4,969
Prior	19,224	14,758
Total	$ 34,651	$ 34,172
Weighted average debt service coverage ratio	1.9	1.9
Weighted average loan-to-value ratio (as a percent)	59.00%	59.00%
Less than 65% \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 702	$ 2,088
2023	2,148	4,470
2022	4,559	2,249
2021	2,341	1,126
2020	1,148	2,676
Prior	12,289	10,186
Total	23,187	22,795
65% to 75% \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	280
2023	278	1,748
2022	2,162	658
2021	660	287
2020	286	1,916
Prior	4,811	2,853
Total	8,197	7,742
76% to 80% \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	343
2022	0	89
2021	89	0
2020	0	377
Prior	773	340
Total	862	1,149
Greater than 80% \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	79
2023	0	598
2022	586	279
2021	317	151
2020	151	0
Prior	1,351	1,379
Total	2,405	2,486
Greater than 1.2X \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	631	2,156
2023	2,037	6,042
2022	6,197	1,955
2021	2,135	1,252
2020	1,274	4,813
Prior	16,026	11,675
Total	28,300	27,893
1.00 - 1.20X \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	71	291
2023	389	1,077
2022	1,070	1,320
2021	1,272	312
2020	311	156
Prior	2,461	2,334
Total	5,574	5,490
Less than 1.00X \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	40
2022	40	0
2021	0	0
2020	0	0
Prior	737	749
Total	$ 777	$ 789

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