Policyholder Account Balances - Schedule of Range Guaranteed Minimum Crediting Rate (Details) $ in Millions	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 13,871	$ 13,843
Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	6,392	6,498
Universal Life Insurance and Investment Contracts
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	4,162	4,193
At guaranteed minimum | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	4,566	4,647
1–50 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	627	639
51–150 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 1,108	$ 1,127
Greater than 150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account base points	0.0150	0.0150
Greater than 150 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 91	$ 85
Minimum | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account base points	0.0001	0.0001
Minimum | 51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account base points	0.0051	0.0051
Maximum | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account base points	0.0050	0.0050
Maximum | 51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account base points	0.0150	0.0150
Less than 2.00% | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 167	$ 173
Less than 2.00% | At guaranteed minimum | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	120	111
Less than 2.00% | 1–50 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	35	39
Less than 2.00% | 51–150 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	12	23
Less than 2.00% | Greater than 150 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 0	$ 0
Less than 2.00% | Maximum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account minimum credit rating	2.00%	2.00%
2.00%–2.99% | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 695	$ 721
2.00%–2.99% | At guaranteed minimum | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	694	720
2.00%–2.99% | 1–50 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	1	1
2.00%–2.99% | 51–150 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	0	0
2.00%–2.99% | Greater than 150 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 0	$ 0
2.00%–2.99% | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account minimum credit rating	2.00%	2.00%
2.00%–2.99% | Maximum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account minimum credit rating	2.99%	2.99%
3.00%–3.99% | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 3,329	$ 3,372
3.00%–3.99% | At guaranteed minimum | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	1,595	1,627
3.00%–3.99% | 1–50 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	570	579
3.00%–3.99% | 51–150 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	1,073	1,081
3.00%–3.99% | Greater than 150 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 91	$ 85
3.00%–3.99% | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account minimum credit rating	3.00%	3.00%
3.00%–3.99% | Maximum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account minimum credit rating	3.99%	3.99%
4.00% and greater | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 2,201	$ 2,232
4.00% and greater | At guaranteed minimum | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	2,157	2,189
4.00% and greater | 1–50 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	21	20
4.00% and greater | 51–150 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	23	23
4.00% and greater | Greater than 150 basis points above | Life Insurance Line, Excluding Policies With Equity Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 0	$ 0
4.00% and greater | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account minimum credit rating	4.00%	4.00%