Investments - Loans by Loan to Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Schedule of Loans by Loan to Value Ratio [Line Items]
Targeted maximum amount of mortgage loans lended, percent of estimated fair value of underlying real estate	75.00%
Benchmark loan to value ratio, greater than indicates unpaid loan amount exceeds underlying collateral	100.00%
Benchmark debt service coverage ratio, less than indicates property's operations income is less than debt payments	100.00%
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 4,602	$ 3,632
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	828	229
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	287	256
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	209	535
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	522	430
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	390	212
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,366	1,970
0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3,191	2,553
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	337	111
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	150	76
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	72	201
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	218	189
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	189	149
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	2,225	1,827
>50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,180	835
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	406	107
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	126	151
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	137	240
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	221	148
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	151	63
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	139	126
>60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	214	228
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	85	11
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	11	29
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0	94
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	83	93
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	35	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0	1
>70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	15	0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	15	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year		0
Debt-to-Value Ratio, 80 to 100 Percent
Schedule of Loans by Loan to Value Ratio [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2	16
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	$ 2	$ 16