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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale $ 37,962 $ 36,231
Fixed maturities, at fair value using the fair value option ("FVO") 332 333
Equity securities, at fair value 878 1,801
Derivative assets (45) 34
Short-term investments 3,300 3,859
Total assets accounted for at fair value on a recurring basis 42,427 42,258
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 30 13
Total liabilities accounted for at fair value on a recurring basis 30 13
Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets (58) 2
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (1) (2)
Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 9 32
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 31 21
Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 4  
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities   (6)
Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3,130 1,941
Collateralized Loan Obligations [Member]    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3,043 2,941
Fixed maturities, at fair value using the fair value option ("FVO") 173 178
CMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3,124 3,368
Corporate    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 16,651 15,233
Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 567 547
Municipal    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 5,686 6,296
RMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3,827 3,708
U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,934 2,197
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 49 0
Fixed maturities, at fair value using the fair value option ("FVO") 0 0
Equity securities, at fair value 356 1,261
Derivative assets 0 0
Short-term investments 1,187 1,429
Total assets accounted for at fair value on a recurring basis 1,592 2,690
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Total liabilities accounted for at fair value on a recurring basis 0 0
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1) | Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1) | Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1) | Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0  
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities   0
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1) | Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1) | Collateralized Loan Obligations [Member]    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1) | CMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1) | Corporate    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1) | Municipal    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1) | RMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1) | U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 49 0
Significant
Observable
Inputs
(Level 2)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 35,825 34,180
Fixed maturities, at fair value using the fair value option ("FVO") 159 155
Equity securities, at fair value 464 479
Derivative assets (45) 34
Short-term investments 1,928 2,237
Total assets accounted for at fair value on a recurring basis 38,331 37,085
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 30 13
Total liabilities accounted for at fair value on a recurring basis 30 13
Significant
Observable
Inputs
(Level 2) | Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets (58) 2
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (1) (2)
Significant
Observable
Inputs
(Level 2) | Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 9 32
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 31 21
Significant
Observable
Inputs
(Level 2) | Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 4  
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities   (6)
Significant
Observable
Inputs
(Level 2) | Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3,084 1,911
Significant
Observable
Inputs
(Level 2) | Collateralized Loan Obligations [Member]    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 2,946 2,826
Significant
Observable
Inputs
(Level 2) | CMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 2,898 3,146
Significant
Observable
Inputs
(Level 2) | Corporate    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 14,996 13,644
Significant
Observable
Inputs
(Level 2) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 567 547
Significant
Observable
Inputs
(Level 2) | Municipal    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 5,686 6,296
Significant
Observable
Inputs
(Level 2) | RMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3,763 3,613
Significant
Observable
Inputs
(Level 2) | U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,885 2,197
Significant
Unobservable
Inputs
(Level 3)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 2,088 2,051
Fixed maturities, at fair value using the fair value option ("FVO") 173 178
Equity securities, at fair value 58 61
Derivative assets 0 0
Short-term investments 185 193
Total assets accounted for at fair value on a recurring basis 2,504 2,483
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Total liabilities accounted for at fair value on a recurring basis 0 0
Significant
Unobservable
Inputs
(Level 3) | Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Significant
Unobservable
Inputs
(Level 3) | Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Significant
Unobservable
Inputs
(Level 3) | Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0  
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities   0
Significant
Unobservable
Inputs
(Level 3) | Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 46 30
Significant
Unobservable
Inputs
(Level 3) | Collateralized Loan Obligations [Member]    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 97 115
Significant
Unobservable
Inputs
(Level 3) | CMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 226 222
Significant
Unobservable
Inputs
(Level 3) | Corporate    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,655 1,589
Significant
Unobservable
Inputs
(Level 3) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Significant
Unobservable
Inputs
(Level 3) | Municipal    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Significant
Unobservable
Inputs
(Level 3) | RMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 64 95
Significant
Unobservable
Inputs
(Level 3) | U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale $ 0 $ 0