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Investments (Assets Supporting Experience-Rated Contractholder Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost | $ 2,496 | $ 2,612
Assets supporting experience-rated contractholder liabilities, at fair value | 3,168 | 2,844
Fixed maturities |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost | 889 | 984
Assets supporting experience-rated contractholder liabilities, at fair value | 889 | 945
Equity securities |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost | 1,607 | 1,628
Assets supporting experience-rated contractholder liabilities, at fair value | 2,279 | 1,899
Corporate securities |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost | 81 | 91
Assets supporting experience-rated contractholder liabilities, at fair value | 79 | 88
Foreign government bonds |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost | 606 | 705
Assets supporting experience-rated contractholder liabilities, at fair value | 604 | 668
Obligations of U.S. government authorities and agencies and obligations of U.S. states |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost | 202 | 188
Assets supporting experience-rated contractholder liabilities, at fair value | $ 206 | $ 189
NAIC High or Highest Quality Rating | Fixed maturities |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost percentage | 99.00% | 98.00%

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