Lending Activities - Credit quality of commercial mortgages (Details) $ in Millions	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 49,421	$ 47,565
Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,146	2,447
2023	2,485	7,159
2022	7,374	3,275
2021	3,146	1,564
2020	1,582	4,969
Prior	18,953	14,758
Total	$ 34,686	$ 34,172
Weighted average debt service coverage ratio	1.9	1.9
Weighted average loan-to-value ratio (as a percent)	60.00%	59.00%
Less than 65% \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 1,075	$ 2,088
2023	2,099	4,470
2022	4,878	2,249
2021	2,285	1,126
2020	1,140	2,676
Prior	12,132	10,186
Total	23,609	22,795
65% to 75% \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	71	280
2023	386	1,748
2022	1,915	658
2021	642	287
2020	285	1,916
Prior	4,357	2,853
Total	7,656	7,742
76% to 80% \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	343
2022	0	89
2021	47	0
2020	0	377
Prior	724	340
Total	771	1,149
Greater than 80% \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	79
2023	0	598
2022	581	279
2021	172	151
2020	157	0
Prior	1,740	1,379
Total	2,650	2,486
Greater than 1.2X \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	916	2,156
2023	2,160	6,042
2022	6,236	1,955
2021	2,127	1,252
2020	1,270	4,813
Prior	15,711	11,675
Total	28,420	27,893
1.00 - 1.20X \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	230	291
2023	325	1,077
2022	1,099	1,320
2021	1,019	312
2020	312	156
Prior	2,411	2,334
Total	5,396	5,490
Less than 1.00X \| Commercial Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	40
2022	39	0
2021	0	0
2020	0	0
Prior	831	749
Total	$ 870	$ 789

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