Life Policy And Investment Contract Reservess (Reserve In Addition To The Account Balance Based On Expected No-Lapse Guarantee Benefits And Expected Policy Assessments) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	$ 3,068	$ 3,015
Life Policy Reserves
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	1,597	1,463
Life Policy Reserves | Term Life Insurance
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	1,066	961
Life Policy Reserves | Whole Life Insurance
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	434	408
Life Policy Reserves | Long-Duration Insurance, Other
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	97	94
Investment contract reserves
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	1,471	1,552
Investment contract reserves | Deferred Fixed Annuity
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	656	734
Investment contract reserves | Universal Life
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	585	578
Investment contract reserves | Structured Settlement Annuity
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	123	129
Investment contract reserves | Long-Duration Insurance, Other
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	$ 107	$ 111