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Investments (Assets Supporting Experience-Rated Contractholder Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost |  | $ 22,809 | $ 22,438
Assets supporting experience-rated contractholder liabilities, at fair value | [1] | 24,027 | 24,115
Fixed maturities |  |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost |  | 20,438 | 20,119
Assets supporting experience-rated contractholder liabilities, at fair value |  | 21,302 | 21,414
Equity securities |  |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost |  | 1,942 | 1,661
Assets supporting experience-rated contractholder liabilities, at fair value |  | 2,296 | 2,043
Short-term investments and cash equivalents |  |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost |  | 429 | 658
Assets supporting experience-rated contractholder liabilities, at fair value |  | 429 | 658
Corporate securities | Fixed maturities |  |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost |  | 14,470 | 14,442
Assets supporting experience-rated contractholder liabilities, at fair value |  | 15,130 | 15,472
Commercial mortgage-backed securities | Fixed maturities |  |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost |  | 1,699 | 1,743
Assets supporting experience-rated contractholder liabilities, at fair value |  | 1,773 | 1,839
Residential mortgage-backed securities | Fixed maturities |  |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost |  | 873 | 964
Assets supporting experience-rated contractholder liabilities, at fair value |  | 915 | 1,018
Asset-backed securities | Fixed maturities |  |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost |  | 2,039 | 1,665
Assets supporting experience-rated contractholder liabilities, at fair value |  | 2,066 | 1,697
Foreign government bonds | Fixed maturities |  |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost |  | 994 | 934
Assets supporting experience-rated contractholder liabilities, at fair value |  | 996 | 945
U.S. government authorities and agencies and obligations of U.S. states | Fixed maturities |  |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost or cost |  | 363 | 371
Assets supporting experience-rated contractholder liabilities, at fair value |  | $ 422 | $ 443
Public Securities |  |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at amortized cost percentage |  | 79.00% | 79.00%
Collateralized loan obligations |  |  |
Assets Supporting Experience-Rated Contractholder Liabilities [Line Items] |  |  |
Assets supporting experience-rated contractholder liabilities, at fair value |  | $ 1,530 | $ 1,102
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 |  | 94.00% | 94.00%
[1] | See Note 4 for details of balances associated with variable interest entities.

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