XML 66 R49.htm IDEA: XBRL DOCUMENT v3.21.1
Investments Investments (Allowance for Credit Loss Roll Forward) (Details) - Available-for-sale Securities [Member] - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance $ 20 $ 0
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 6 33
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold (3)  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses (1)  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 22 33
Commercial Mortgage Backed Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance 3  
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 1  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold (2)  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses (1)  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 1  
Corporate Debt Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance 17 0
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 0 26
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold (1)  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 0  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance 16 26
Debt Security, Government, Non-US [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Beginning Balance 0 0
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase 5 7
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold 0  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses 0  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held, Ending Balance $ 5 $ 7