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Fair Value of Assets and Liabilities (Changes in Fair Values Recorded in Earnings for FVO Assets-Liabilities) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]      
Commercial mortgage and other loans [1] $ 64,554   $ 65,425
Other assets [1] 22,567   22,801
Commercial mortgage and other loans      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Interest income 3 $ 2  
Fair value option loans in non-accrual status 0    
Fair value option loans in more than 90 days past due and still accruing 0    
Notes Issued by Consolidated VIEs      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Changes in fair value 0 0  
Interest expense 0 $ 11  
Fair value option      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Commercial mortgage and other loans 500   1,092
Other assets 10   10
Notes issued by consolidated VIEs 0   0
Fair value option, aggregate contractual principal      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Commercial mortgage and other loans 494   1,073
Notes issued by consolidated VIEs $ 0   $ 0
[1] See Note 4 for details of balances associated with variable interest entities.