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Fair Value of Financial Instruments - Schedule of Changes to Fair Value of Financial Instruments Level 3 (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Liabilities    
Liabilities, Total (Losses) Gains Included in Earnings $ (65) $ 228
Liabilities, Total (Losses) Gains Included in AOCI 1 0
Liabilities, Purchases 256 336
Liabilities, Sales 0 0
Liabilities, Settlements (105) (67)
Liabilities, Net transfer In (Out) of Level 3 $ 0 $ 0
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Recognized gains and losses, net Recognized gains and losses, net
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Unrealized gain (loss) on investments and other financial instruments (excluding investments in unconsolidated affiliates) Unrealized gain (loss) on investments and other financial instruments (excluding investments in unconsolidated affiliates)
Level 3    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period $ 11,734 $ 9,677
Balance at End of Period 12,518 10,476
Liabilities    
Balance at Beginning of Period 5,843 4,661
Balance at End of Period 6,016 5,180
Indexed annuities/indexed universal life insurance ("IUL") embedded derivatives, included in Contractholder funds    
Liabilities    
Balance at Beginning of Period 5,220 4,258
Liabilities, Total (Losses) Gains Included in Earnings (67) 200
Liabilities, Total (Losses) Gains Included in AOCI 0 0
Liabilities, Purchases 256 288
Liabilities, Sales 0 0
Liabilities, Settlements (93) (67)
Liabilities, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 5,316 4,679
Change in Unrealized Gains (Losses) Included in OCI 0 0
Interest rate swaps    
Liabilities    
Balance at Beginning of Period 0 0
Liabilities, Total (Losses) Gains Included in Earnings 0 19
Liabilities, Total (Losses) Gains Included in AOCI 1 0
Liabilities, Purchases 0 0
Liabilities, Sales 0 0
Liabilities, Settlements 0 0
Liabilities, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 1 19
Change in Unrealized Gains (Losses) Included in OCI (1)
Contingent consideration    
Liabilities    
Balance at Beginning of Period 74 0
Liabilities, Total (Losses) Gains Included in Earnings 2 9
Liabilities, Total (Losses) Gains Included in AOCI 0 0
Liabilities, Purchases 0 48
Liabilities, Sales 0 0
Liabilities, Settlements (12) 0
Liabilities, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 64 57
Change in Unrealized Gains (Losses) Included in OCI 0 0
Asset-backed securities    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 8,143 7,122
Assets, Total (Losses) Gains Included in Earnings 1 (12)
Assets, Total (Losses) Gains Included in AOCI 3 104
Assets, Purchases 1,029 762
Assets, Sales (143) (19)
Assets, Settlements (185) (202)
Assets, Net transfer In (Out) of Level 3 0 (19)
Balance at End of Period 8,848 7,736
Change in Unrealized Included in OCI 2 104
Commercial mortgage-backed securities    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 0 18
Assets, Total (Losses) Gains Included in Earnings 0 0
Assets, Total (Losses) Gains Included in AOCI 0 0
Assets, Purchases 0 1
Assets, Sales 0 0
Assets, Settlements 0 0
Assets, Net transfer In (Out) of Level 3 0 (7)
Balance at End of Period 0 12
Change in Unrealized Included in OCI 0 0
Corporates    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 2,957 1,979
Assets, Total (Losses) Gains Included in Earnings (13) 0
Assets, Total (Losses) Gains Included in AOCI 34 13
Assets, Purchases 353 217
Assets, Sales (314) (3)
Assets, Settlements (11) (22)
Assets, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 3,006 2,184
Change in Unrealized Included in OCI 33 13
Hybrids    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 0  
Assets, Total (Losses) Gains Included in Earnings 0  
Assets, Total (Losses) Gains Included in AOCI 0  
Assets, Purchases 6  
Assets, Sales 0  
Assets, Settlements 0  
Assets, Net transfer In (Out) of Level 3 0  
Balance at End of Period 6  
Change in Unrealized Included in OCI 0  
Municipals    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 0 49
Assets, Total (Losses) Gains Included in Earnings 0 0
Assets, Total (Losses) Gains Included in AOCI 0 1
Assets, Purchases 4 0
Assets, Sales 0 (32)
Assets, Settlements 0 0
Assets, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 4 18
Change in Unrealized Included in OCI 0 1
Residential mortgage-backed securities    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 3 3
Assets, Total (Losses) Gains Included in Earnings 0 0
Assets, Total (Losses) Gains Included in AOCI 0 0
Assets, Purchases 0 1
Assets, Sales 0 0
Assets, Settlements 0 0
Assets, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 3 4
Change in Unrealized Included in OCI 0 0
Foreign Governments    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 4 16
Assets, Total (Losses) Gains Included in Earnings 0 0
Assets, Total (Losses) Gains Included in AOCI 0 0
Assets, Purchases 19 0
Assets, Sales 0 0
Assets, Settlements 0 (11)
Assets, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 23 5
Change in Unrealized Included in OCI 0 0
Preferred securities    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 8 8
Assets, Total (Losses) Gains Included in Earnings (1) 0
Assets, Total (Losses) Gains Included in AOCI 1 0
Assets, Purchases 0 0
Assets, Sales 0 0
Assets, Settlements 0 0
Assets, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 8 8
Change in Unrealized Included in OCI 0 0
Equity securities    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 10 15
Assets, Total (Losses) Gains Included in Earnings 0 (1)
Assets, Total (Losses) Gains Included in AOCI 0 0
Assets, Purchases 0 0
Assets, Sales 0 0
Assets, Settlements 0 0
Assets, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 10 14
Change in Unrealized Included in OCI 0 0
Interest rate swaps    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period   57
Assets, Total (Losses) Gains Included in Earnings   (48)
Assets, Total (Losses) Gains Included in AOCI   0
Assets, Purchases   0
Assets, Sales   0
Assets, Settlements   0
Assets, Net transfer In (Out) of Level 3   0
Balance at End of Period   9
Change in Unrealized Included in OCI   0
Interest rate swaps    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 3  
Assets, Total (Losses) Gains Included in Earnings 0  
Assets, Total (Losses) Gains Included in AOCI (2)  
Assets, Purchases 0  
Assets, Sales 0  
Assets, Settlements 0  
Assets, Net transfer In (Out) of Level 3 0  
Balance at End of Period 1  
Change in Unrealized Included in OCI (2)  
Investment in unconsolidated affiliates    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 272 285
Assets, Total (Losses) Gains Included in Earnings 0 58
Assets, Total (Losses) Gains Included in AOCI 0 0
Assets, Purchases 0 0
Assets, Sales 0 0
Assets, Settlements 0 0
Assets, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 272 343
Change in Unrealized Included in OCI 0 0
Short term investments    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 37 0
Assets, Total (Losses) Gains Included in Earnings 0 0
Assets, Total (Losses) Gains Included in AOCI 0 0
Assets, Purchases 3 9
Assets, Sales 0 0
Assets, Settlements 0 0
Assets, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 40 9
Change in Unrealized Included in OCI 0 0
Available-for-sale embedded derivative    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 32 27
Assets, Total (Losses) Gains Included in Earnings 0 0
Assets, Total (Losses) Gains Included in AOCI 0 3
Assets, Purchases 0 0
Assets, Sales 0 0
Assets, Settlements 0 0
Assets, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 32 30
Change in Unrealized Included in OCI 0 3
Credit linked note    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 0 10
Assets, Total (Losses) Gains Included in Earnings 0 0
Assets, Total (Losses) Gains Included in AOCI 0 0
Assets, Purchases 0 0
Assets, Sales 0 0
Assets, Settlements 0 (1)
Assets, Net transfer In (Out) of Level 3 0 0
Balance at End of Period 0 9
Change in Unrealized Included in OCI 0 0
Loan receivable    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 11  
Assets, Total (Losses) Gains Included in Earnings 0  
Assets, Total (Losses) Gains Included in AOCI 0  
Assets, Purchases 0  
Assets, Sales 0  
Assets, Settlements 0  
Assets, Net transfer In (Out) of Level 3 0  
Balance at End of Period 11  
Change in Unrealized Included in OCI 0  
Other assets    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 65  
Assets, Total (Losses) Gains Included in Earnings 0  
Assets, Total (Losses) Gains Included in AOCI 0  
Assets, Purchases 2  
Assets, Sales 0  
Assets, Settlements 0  
Assets, Net transfer In (Out) of Level 3 0  
Balance at End of Period 67  
Change in Unrealized Included in OCI 0  
Subtotal Level 3 assets at fair value | Level 3    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 11,545 9,589
Assets, Total (Losses) Gains Included in Earnings (13) (3)
Assets, Total (Losses) Gains Included in AOCI 36 121
Assets, Purchases 1,416 990
Assets, Sales (457) (54)
Assets, Settlements (196) (236)
Assets, Net transfer In (Out) of Level 3 0 (26)
Balance at End of Period 12,331 10,381
Change in Unrealized Included in OCI 33 121
Market risk benefits asset | Level 3    
Fixed maturity securities available-for-sale:    
Balance at Beginning of Period 189 88
Balance at End of Period 187 95
Subtotal Level 3 liabilities at fair value    
Liabilities    
Change in Unrealized Gains (Losses) Included in OCI (1) 0
Subtotal Level 3 liabilities at fair value | Level 3    
Liabilities    
Balance at Beginning of Period 5,294 4,258
Balance at End of Period 5,381 4,755
Market risk benefits liability | Level 3    
Liabilities    
Balance at Beginning of Period 549 403
Balance at End of Period $ 635 $ 425