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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale $ 43,942 $ 45,035
Equity securities, at fair value 1,616 1,438
Derivative assets 2 23
Fixed maturities, at fair value using the fair value option 75 0
Short-term investments 3,612 3,283
Total assets accounted for at fair value on a recurring basis 49,247 49,779
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (38) (84)
Total liabilities accounted for at fair value on a recurring basis (38) (84)
Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 1 21
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 5  
Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 1 1
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 2 (14)
Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets   1
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (45) (70)
Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,207 1,564
Collateralized Loan Obligations [Member]    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3,011 2,780
CMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 4,191 4,484
Corporate    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 18,861 20,273
Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 953 919
Municipal    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 8,878 9,503
RMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3,286 4,107
U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3,555 1,405
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 618 529
Equity securities, at fair value 991 872
Derivative assets 0 0
Fixed maturities, at fair value using the fair value option 0  
Short-term investments 1,941 2,663
Total assets accounted for at fair value on a recurring basis 3,550 4,064
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  
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 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 618 529
Significant
Observable
Inputs
(Level 2)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 41,319 42,801
Equity securities, at fair value 554 496
Derivative assets 2 23
Fixed maturities, at fair value using the fair value option 0  
Short-term investments 1,648 590
Total assets accounted for at fair value on a recurring basis 43,523 43,910
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (38) (84)
Total liabilities accounted for at fair value on a recurring basis (38) (84)
Significant
Observable
Inputs
(Level 2) | Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 1 21
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 5  
Significant
Observable
Inputs
(Level 2) | Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 1 1
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 2 (14)
Significant
Observable
Inputs
(Level 2) | Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets   1
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (45) (70)
Significant
Observable
Inputs
(Level 2) | Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,184 1,564
Significant
Observable
Inputs
(Level 2) | Collateralized Loan Obligations [Member]    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 2,657 2,420
Significant
Observable
Inputs
(Level 2) | CMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 4,090 4,407
Significant
Observable
Inputs
(Level 2) | Corporate    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 17,607 19,392
Significant
Observable
Inputs
(Level 2) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 948 913
Significant
Observable
Inputs
(Level 2) | Municipal    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 8,878 9,503
Significant
Observable
Inputs
(Level 2) | RMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3,018 3,726
Significant
Observable
Inputs
(Level 2) | U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 2,937 876
Significant
Unobservable
Inputs
(Level 3)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 2,005 1,705
Equity securities, at fair value 71 70
Derivative assets 0 0
Fixed maturities, at fair value using the fair value option 75  
Short-term investments 23 30
Total assets accounted for at fair value on a recurring basis 2,174 1,805
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  
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 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 23 0
Significant
Unobservable
Inputs
(Level 3) | Collateralized Loan Obligations [Member]    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 354 360
Significant
Unobservable
Inputs
(Level 3) | CMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 101 77
Significant
Unobservable
Inputs
(Level 3) | Corporate    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,254 881
Significant
Unobservable
Inputs
(Level 3) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 5 6
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 268 381
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
Fair Value Measured at Net Asset Value Per Share [Member]    
Liabilities accounted for at fair value on a recurring basis    
Deposit Assets $ 62 $ 54