Reserves in Addition to Account Balance, Based on Expected No-Lapse Guarantee Benefits and Expected Policy Assessments (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	$ 3,059	$ 3,015
Life policy reserves:
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	1,532	1,463
Investment contract reserves:
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	1,527	1,552
Term Life Insurance | Life policy reserves:
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	1,011	961
Whole Life Insurance | Life policy reserves:
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	427	408
Long-Duration Insurance, Other | Life policy reserves:
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	94	94
Long-Duration Insurance, Other | Investment contract reserves:
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	105	111
Deferred Fixed Annuity | Investment contract reserves:
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	711	734
Universal life | Investment contract reserves:
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	583	578
Structured Settlement Annuity | Investment contract reserves:
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	$ 128	$ 129