Lending Activities - Credit Quality of Commercial Mortgages (Details) - Commercial mortgages $ in Millions	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
2025	$ 14	$ 146
2024	38	494
2023	229	200
2022	117	612
2021	592	79
Prior	1,505	1,774
Total	$ 2,495	$ 3,305
Weighted average debt service coverage ratio	1.8	1.8
Weighted average loan-to-value ratio (as a percent)	71.00%	65.00%
Less than 65%
Financing Receivable, Credit Quality Indicator [Line Items]
2025	$ 14	$ 107
2024	38	433
2023	213	177
2022	94	485
2021	468	71
Prior	808	1,012
Total	1,635	2,285
65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	40
2023	11	0
2022	0	54
2021	68	0
Prior	463	317
Total	542	411
76% to 80%
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	31
2021	9	0
Prior	0	51
Total	9	82
Greater than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	39
2024	0	21
2023	5	23
2022	23	42
2021	47	8
Prior	234	394
Total	309	527
Greater than 1.2X
Financing Receivable, Credit Quality Indicator [Line Items]
2025	14	120
2024	38	484
2023	196	185
2022	117	563
2021	538	79
Prior	1,237	1,482
Total	2,140	2,913
1.00 - 1.20X
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	26
2024	0	10
2023	28	15
2022	0	17
2021	29	0
Prior	147	49
Total	204	117
Less than 1.00X
Financing Receivable, Credit Quality Indicator [Line Items]
2025	0	0
2024	0	0
2023	5	0
2022	0	32
2021	25	0
Prior	121	243
Total	$ 151	$ 275

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