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Investments - Commercial Mortgage Loans LTV & DSCR (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Schedule of Investments [Line Items]
Number of loans held-for-sale	0	0
Financing Receivable, Modifications, Number of Contracts	1	0
LTV ratio	56.00%
LTV ratio at origination	59.00%
Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.47	2.60
Financing Receivable, before Allowance for Credit Loss	$ 6,440	$ 6,138
Financing Receivable, Allowance for Credit Loss	$ 44	$ 51	$ 36	$ 29
Commercial Loan [Member] | LTV Greater Than 80 Percent
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.34	1.29
Commercial Loan [Member] | 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.26	2.25
Commercial Loan [Member] | Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.57	2.72
Amortized Cost [Member] | Commercial Loan [Member]
Schedule of Investments [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 471	$ 400
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	496	929
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	916	1,600
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,566	622
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	618	777
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,373	1,810
Financing Receivable, before Allowance for Credit Loss	6,440	6,138
Amortized Cost [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent
Schedule of Investments [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	25	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	16
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	16	38
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	37	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	110	105
Financing Receivable, before Allowance for Credit Loss	188	159
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80%
Schedule of Investments [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	89	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	7	189
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	204	457
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	421	95
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	100	98
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	439	252
Financing Receivable, before Allowance for Credit Loss	1,260	1,091
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65%
Schedule of Investments [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	357	400
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	489	724
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	696	1,105
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,108	527
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	518	679
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,824	1,453
Financing Receivable, before Allowance for Credit Loss	$ 4,992	$ 4,888
Originated in Current Fiscal Year [Member] | Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.52	1.47
Originated in Current Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	0.63	0
Originated in Current Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.42	0
Originated in Current Fiscal Year [Member] | Commercial Loan [Member] | Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.62	1.47
Originated in Fiscal Year before Latest Fiscal Year [Member] | Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.39	2.60
Originated in Fiscal Year before Latest Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	0	1.09
Originated in Fiscal Year before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.35	2.13
Originated in Fiscal Year before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.39	2.75
Originated Two Years before Latest Fiscal Year [Member] | Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.61	2.78
Originated Two Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.05	1.05
Originated Two Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.89	2.42
Originated Two Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.85	2.99
Originated Three Years before Latest Fiscal Year [Member] | Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.79	3.00
Originated Three Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.03	0
Originated Three Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.55	3.47
Originated Three Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.93	2.92
Originated Four Years before Latest Fiscal Year [Member] | Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.82	2.76
Originated Four Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	0	0
Originated Four Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	3.60	1.77
Originated Four Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.67	2.90
Originated Five or More Years before Latest Fiscal Year [Member] | Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.53	2.47
Originated Five or More Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.68	1.41
Originated Five or More Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.01	1.77
Originated Five or More Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.71	2.67

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