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Fair Value of Financial Instruments - Carrying Amounts of Assets and Liabilities at Estimated Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Assets |  |  |
Fixed maturity securities available for sale | $ 36,110 | $ 33,095 |
Derivative asset | 432 | 244 |
Market risk benefits asset | 106 | 117 | $ 41
Total financial assets at fair value | 8,229 | 8,286 |
Derivatives: |  |  |
Market risk benefits liability | 324 | 282 | $ 469
Level 1 |  |  |
Assets |  |  |
Cash and cash equivalents | 2,821 | 2,286 |
Short term investments | 1,315 | 2,590 |
Derivative asset | 0 | 0 |
Market risk benefits asset | 0 | 0 |
Total financial assets at fair value | 5,542 | 6,210 |
Derivatives: |  |  |
Market risk benefits liability | 0 | 0 |
Total financial liabilities at fair value | 0 | 0 |
Level 2 |  |  |
Assets |  |  |
Cash and cash equivalents | 0 | 0 |
Short term investments | 8 | 0 |
Derivative asset | 432 | 244 |
Market risk benefits asset | 0 | 0 |
Total financial assets at fair value | 29,002 | 25,720 |
Derivatives: |  |  |
Market risk benefits liability | 0 | 0 |
Total financial liabilities at fair value | 0 | 0 |
Level 3 |  |  |
Assets |  |  |
Cash and cash equivalents | 0 | 0 |
Short term investments | 23 | 0 |
Derivative asset | 0 | 0 |
Market risk benefits asset | 106 | 117 |
Total financial assets at fair value | 8,229 | 8,286 |
Derivatives: |  |  |
Market risk benefits liability | 324 | 282 |
Total financial liabilities at fair value | 3,893 | 3,397 |
NAV |  |  |
Assets |  |  |
Total financial assets at fair value | 42 | 47 |
Fair Value |  |  |
Assets |  |  |
Cash and cash equivalents | 2,821 | 2,286 |
Short term investments | 1,346 | 2,590 |
Derivative asset | 432 | 244 |
Market risk benefits asset | 106 | 117 |
Total financial assets at fair value | 42,815 | 40,263 |
Derivatives: |  |  |
Market risk benefits liability | 324 | 282 |
Total financial liabilities at fair value | 3,893 | 3,397 |
Reinsurance related embedded derivative, included in other assets | Level 1 |  |  |
Assets |  |  |
Derivative asset | 0 | 0 |
Reinsurance related embedded derivative, included in other assets | Level 2 |  |  |
Assets |  |  |
Derivative asset | 260 | 279 |
Reinsurance related embedded derivative, included in other assets | Level 3 |  |  |
Assets |  |  |
Derivative asset | 0 | 0 |
Reinsurance related embedded derivative, included in other assets | Fair Value |  |  |
Assets |  |  |
Derivative asset | 260 | 279 |
FIA/ IUL embedded derivatives, included in contractholder funds | Level 1 |  |  |
Derivatives: |  |  |
Derivative liability | 0 | 0 |
FIA/ IUL embedded derivatives, included in contractholder funds | Level 2 |  |  |
Derivatives: |  |  |
Derivative liability | 0 | 0 |
FIA/ IUL embedded derivatives, included in contractholder funds | Level 3 |  |  |
Derivatives: |  |  |
Derivative liability | 3,569 | 3,115 |
FIA/ IUL embedded derivatives, included in contractholder funds | Fair Value |  |  |
Derivatives: |  |  |
Derivative liability | 3,569 | 3,115 |
Asset-backed securities |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 11,892 | 11,467 |
Asset-backed securities | Level 1 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 0 | 0 |
Asset-backed securities | Level 2 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 5,592 | 5,204 |
Asset-backed securities | Level 3 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 6,300 | 6,263 |
Asset-backed securities | Fair Value |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 11,892 | 11,467 |
Commercial mortgage-backed securities |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 3,715 | 3,063 |
Commercial mortgage-backed securities | Level 1 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 0 | 0 |
Commercial mortgage-backed securities | Level 2 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 3,686 | 3,026 |
Commercial mortgage-backed securities | Level 3 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 29 | 37 |
Commercial mortgage-backed securities | Fair Value |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 3,715 | 3,063 |
Corporates |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 15,831 | 14,337 |
Corporates | Level 1 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 25 | 40 |
Corporates | Level 2 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 14,262 | 12,857 |
Corporates | Level 3 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 1,544 | 1,440 |
Corporates | Fair Value |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 15,831 | 14,337 |
Hybrids |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 780 | 731 |
Hybrids | Level 1 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 97 | 93 |
Hybrids | Level 2 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 683 | 638 |
Hybrids | Level 3 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 0 | 0 |
Hybrids | Fair Value |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 780 | 731 |
Municipals | Level 1 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 0 | 0 |
Municipals | Level 2 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 1,597 | 1,431 |
Municipals | Level 3 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 32 | 29 |
Municipals | Fair Value |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 1,629 | 1,460 |
Residential mortgage-backed securities |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 1,669 | 1,527 |
Residential mortgage-backed securities | Level 1 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 0 | 0 |
Residential mortgage-backed securities | Level 2 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 1,657 | 1,225 |
Residential mortgage-backed securities | Level 3 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 12 | 302 |
Residential mortgage-backed securities | Fair Value |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 1,669 | 1,527 |
U.S. Government |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 329 | 271 |
U.S. Government | Level 1 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 318 | 260 |
U.S. Government | Level 2 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 11 | 11 |
U.S. Government | Level 3 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 0 | 0 |
U.S. Government | Fair Value |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 329 | 271 |
Foreign Governments |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 265 | 239 |
Foreign Governments | Level 1 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 0 | 0 |
Foreign Governments | Level 2 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 249 | 223 |
Foreign Governments | Level 3 |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 16 | 16 |
Foreign Governments | Fair Value |  |  |
Assets |  |  |
Fixed maturity securities available for sale | 265 | 239 |
Preferred securities |  |  |
Assets |  |  |
Equity and preferred securities | 851 | 903 |
Preferred securities | Level 1 |  |  |
Assets |  |  |
Equity and preferred securities | 285 | 320 |
Preferred securities | Level 2 |  |  |
Assets |  |  |
Equity and preferred securities | 565 | 582 |
Preferred securities | Level 3 |  |  |
Assets |  |  |
Equity and preferred securities | 1 | 1 |
Preferred securities | Fair Value |  |  |
Assets |  |  |
Equity and preferred securities | 851 | 903 |
Equity securities | Level 1 |  |  |
Assets |  |  |
Equity and preferred securities | 681 | 621 |
Equity securities | Level 2 |  |  |
Assets |  |  |
Equity and preferred securities | 0 | 0 |
Equity securities | Level 3 |  |  |
Assets |  |  |
Equity and preferred securities | 11 | 10 |
Equity securities | NAV |  |  |
Assets |  |  |
Equity and preferred securities | 42 | 47 |
Equity securities | Fair Value |  |  |
Assets |  |  |
Equity and preferred securities | 734 | 678 |
Investment in unconsolidated affiliates | Level 1 |  |  |
Assets |  |  |
Investment in unconsolidated affiliates | 0 | 0 |
Investment in unconsolidated affiliates | Level 2 |  |  |
Assets |  |  |
Investment in unconsolidated affiliates | 0 | 0 |
Investment in unconsolidated affiliates | Level 3 |  |  |
Assets |  |  |
Investment in unconsolidated affiliates | 107 | 23 |
Investment in unconsolidated affiliates | Fair Value |  |  |
Assets |  |  |
Investment in unconsolidated affiliates | 107 | 23 |
Other long-term investments | Level 1 |  |  |
Assets |  |  |
Other long-term investments | 0 | 0 |
Other long-term investments | Level 2 |  |  |
Assets |  |  |
Other long-term investments | 0 | 0 |
Other long-term investments | Level 3 |  |  |
Assets |  |  |
Other long-term investments | 48 | 48 |
Other long-term investments | Fair Value |  |  |
Assets |  |  |
Other long-term investments | $ 48 | $ 48 |

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