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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]      
Interest expense $ 1,762 $ 1,596 $ 1,478
Commercial mortgage and other loans [1] 59,305 56,745  
Other Assets [1] 13,179 [2] 12,686 [3],[4]  
Commercial mortgage and other loans      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Interest income 9 23 15
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 (9) 0 0
Interest expense 11 0 $ 0
Fair value option      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Commercial mortgage and other loans 519 137  
Other Assets 11 11  
Notes issued by consolidated VIEs 778 0  
Fair value option, aggregate contractual principal      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Commercial mortgage and other loans 512 136  
Notes issued by consolidated VIEs $ 787 $ 0  
[1] See Note 4 for details of balances associated with variable interest entities.
[2] See Note 24 for additional information regarding related party transactions.
[3] Prior period amounts have been reclassified to conform to current period presentation.
[4] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.