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Fair Value Measurements - Financial Assets and Financial Liabilities Carried at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financial assets at fair value:    
Debt securities $ 18,131  
Debt securities   $ 23,755
Equity securities 202  
Equity securities   64
Financial liabilities at fair value    
Unfunded commitments 50  
Recurring    
Financial assets at fair value:    
Debt securities 18,131  
Debt securities   23,755
Equity securities 246  
Equity securities   111
Short-term investments 325  
Short-term investments   423
Real estate funds priced at NAV as a practical expedient 156  
Real estate funds priced at NAV as a practical expedient   184
Recurring | Other Derivatives    
Financial assets at fair value:    
Derivative assets 72  
Derivative assets   83
Financial liabilities at fair value    
Derivative liabilities 108  
Derivative liabilities   18
Recurring | Other Derivatives | Short-term investments    
Financial assets at fair value:    
Derivative assets 34  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring    
Financial assets at fair value:    
Debt securities 207  
Debt securities   197
Equity securities 50  
Equity securities   7
Short-term investments 0  
Short-term investments   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring | Other Derivatives    
Financial assets at fair value:    
Derivative assets 0  
Derivative assets   0
Financial liabilities at fair value    
Derivative liabilities 0  
Derivative liabilities   0
Significant Other Observable Inputs (Level 2) | Recurring    
Financial assets at fair value:    
Debt securities 17,101  
Debt securities   23,035
Equity securities 165  
Equity securities   72
Short-term investments 325  
Short-term investments   423
Significant Other Observable Inputs (Level 2) | Recurring | Other Derivatives    
Financial assets at fair value:    
Derivative assets 72  
Derivative assets   83
Financial liabilities at fair value    
Derivative liabilities 108  
Derivative liabilities   18
Significant Unobservable Inputs (Level 3) | Recurring    
Financial assets at fair value:    
Debt securities 823  
Debt securities   523
Equity securities 31  
Equity securities   32
Short-term investments 0  
Short-term investments   0
Significant Unobservable Inputs (Level 3) | Recurring | Other Derivatives    
Financial assets at fair value:    
Derivative assets 0  
Derivative assets   0
Financial liabilities at fair value    
Derivative liabilities 0  
Derivative liabilities   0
Federal government and agency    
Financial assets at fair value:    
Debt securities 456  
Debt securities   733
Federal government and agency | Recurring    
Financial assets at fair value:    
Debt securities 456  
Debt securities   733
Federal government and agency | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring    
Financial assets at fair value:    
Debt securities 207  
Debt securities   197
Federal government and agency | Significant Other Observable Inputs (Level 2) | Recurring    
Financial assets at fair value:    
Debt securities 249  
Debt securities   536
Federal government and agency | Significant Unobservable Inputs (Level 3) | Recurring    
Financial assets at fair value:    
Debt securities 0  
Debt securities   0
State and local government    
Financial assets at fair value:    
Debt securities 167  
Debt securities   810
State and local government | Recurring    
Financial assets at fair value:    
Debt securities 167  
Debt securities   810
State and local government | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring    
Financial assets at fair value:    
Debt securities 0  
Debt securities   0
State and local government | Significant Other Observable Inputs (Level 2) | Recurring    
Financial assets at fair value:    
Debt securities 167  
Debt securities   810
State and local government | Significant Unobservable Inputs (Level 3) | Recurring    
Financial assets at fair value:    
Debt securities 0  
Debt securities   0
Foreign government    
Financial assets at fair value:    
Debt securities 2,511  
Debt securities   2,256
Foreign government | Recurring    
Financial assets at fair value:    
Debt securities 2,511  
Debt securities   2,256
Foreign government | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring    
Financial assets at fair value:    
Debt securities 0  
Debt securities   0
Foreign government | Significant Other Observable Inputs (Level 2) | Recurring    
Financial assets at fair value:    
Debt securities 2,498  
Debt securities   2,228
Foreign government | Significant Unobservable Inputs (Level 3) | Recurring    
Financial assets at fair value:    
Debt securities 13  
Debt securities   28
Corporate    
Financial assets at fair value:    
Debt securities 14,562  
Debt securities   19,420
Corporate | Recurring    
Financial assets at fair value:    
Debt securities 14,562  
Debt securities   19,420
Corporate | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring    
Financial assets at fair value:    
Debt securities 0  
Debt securities   0
Corporate | Significant Other Observable Inputs (Level 2) | Recurring    
Financial assets at fair value:    
Debt securities 13,878  
Debt securities   19,063
Corporate | Significant Unobservable Inputs (Level 3) | Recurring    
Financial assets at fair value:    
Debt securities 684  
Debt securities   357
Mortgage and other asset-backed    
Financial assets at fair value:    
Debt securities 435  
Debt securities   536
Mortgage and other asset-backed | Recurring    
Financial assets at fair value:    
Debt securities 435  
Debt securities   536
Mortgage and other asset-backed | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring    
Financial assets at fair value:    
Debt securities 0  
Debt securities   0
Mortgage and other asset-backed | Significant Other Observable Inputs (Level 2) | Recurring    
Financial assets at fair value:    
Debt securities 309  
Debt securities   398
Mortgage and other asset-backed | Significant Unobservable Inputs (Level 3) | Recurring    
Financial assets at fair value:    
Debt securities $ 126  
Debt securities   $ 138