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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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]      
Interest expense $ 1,550 $ 1,420 $ 1,327
Commercial mortgage and other loans [1] 63,559 59,830  
Other assets [1] 20,832 16,118  
Commercial mortgage and other loans      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Interest income 20 18 13
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 (15) (14) 4
Interest expense 45 36 $ 75
Fair value option      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Commercial mortgage and other loans 228 763  
Other assets 10 10  
Notes issued by consolidated VIEs 800 595  
Fair value option, aggregate contractual principal      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Commercial mortgage and other loans 224 754  
Notes issued by consolidated VIEs $ 857 $ 632  
[1]
See Note 4 for details of balances associated with variable interest entities.