Lending Activities - Credit Quality of Commercial Mortgages (Details) - Commercial mortgages - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]
2026	$ 126	$ 14
2025	14	38
2024	38	229
2023	155	117
2022	109	592
Prior	1,654	1,505
Total	$ 2,096	$ 2,495
Weighted average loan-to-value ratio (as a percent)	66.00%	71.00%
Less than 65%
Financing Receivable, Credit Quality Indicator [Line Items]
2026	$ 106	$ 14
2025	14	38
2024	38	213
2023	150	94
2022	79	468
Prior	971	808
Total	1,358	1,635
65% to 80%
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0	0
2025	0	0
2024	0	11
2023	0	0
2022	7	77
Prior	429	463
Total	436	551
Greater than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
2026	20	0
2025	0	0
2024	0	5
2023	5	23
2022	23	47
Prior	254	234
Total	$ 302	$ 309

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