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Fair Value Measurements - Assets measured at fair value on a non-recurring basis and related impairment charges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other invested assets [1] $ 15,953 $ 15,668  
Impairment Charges 26 46 $ 98
Fair value on a non-recurring basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other invested assets 12 104  
Other assets 0    
Total 12 104  
Impairment Charges 26 73 91
Fair value on a non-recurring basis | Other investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment Charges 25 6 77
Fair value on a non-recurring basis | Asset Class to Loans Held For Sale      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total 163    
Fair value on a non-recurring basis | Other assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment Charges 1 67 $ 14
Fair value on a non-recurring basis | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other invested assets 0 0  
Other assets 0    
Total 0 0  
Fair value on a non-recurring basis | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other invested assets 0 0  
Other assets 0    
Total 0 0  
Fair value on a non-recurring basis | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other invested assets 12 104  
Other assets 0    
Total $ 12 $ 104  
[1] See Note 9 for details of balances associated with variable interest entities.